doc,worker: use code markup/markdown in headers

Backport-PR-URL: #31108
PR-URL: #31086
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

doc/api/worker_threads.md

@@ -53,7 +53,7 @@ When implementing a worker pool, use the [`AsyncResource`][] API to inform
 diagnostic tools (e.g. in order to provide asynchronous stack traces) about the
 correlation between tasks and their outcomes.
 
-## worker.isMainThread
+## `worker.isMainThread`
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@@ -74,7 +74,7 @@ if (isMainThread) {
 }
 ```
 
-## worker.moveMessagePortToContext(port, contextifiedSandbox)
+## `worker.moveMessagePortToContext(port, contextifiedSandbox)`
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@@ -98,7 +98,7 @@ However, the created `MessagePort` will no longer inherit from
 [`EventEmitter`][], and only [`port.onmessage()`][] can be used to receive
 events using it.
 
-## worker.parentPort
+## `worker.parentPort`
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@@ -129,7 +129,7 @@ if (isMainThread) {
 }
 ```
 
-## worker.receiveMessageOnPort(port)
+## `worker.receiveMessageOnPort(port)`
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@@ -157,7 +157,7 @@ console.log(receiveMessageOnPort(port2));
 When this function is used, no `'message'` event will be emitted and the
 `onmessage` listener will not be invoked.
 
-## worker.SHARE_ENV
+## `worker.SHARE_ENV`
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@@ -176,7 +176,7 @@ new Worker('process.env.SET_IN_WORKER = "foo"', { eval: true, env: SHARE_ENV })
   });
 ```
 
-## worker.threadId
+## `worker.threadId`
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@@ -187,7 +187,7 @@ An integer identifier for the current thread. On the corresponding worker object
 (if there is any), it is available as [`worker.threadId`][].
 This value is unique for each [`Worker`][] instance inside a single process.
 
-## worker.workerData
+## `worker.workerData`
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@@ -208,7 +208,7 @@ if (isMainThread) {
 }
 ```
 
-## Class: MessageChannel
+## Class: `MessageChannel`
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@@ -228,7 +228,7 @@ port2.postMessage({ foo: 'bar' });
 // Prints: received { foo: 'bar' } from the `port1.on('message')` listener
 ```
 
-## Class: MessagePort
+## Class: `MessagePort`
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@@ -243,7 +243,7 @@ structured data, memory regions and other `MessagePort`s between different
 With the exception of `MessagePort`s being [`EventEmitter`][]s rather
 than [`EventTarget`][]s, this implementation matches [browser `MessagePort`][]s.
 
-### Event: 'close'
+### Event: `'close'`
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@@ -265,7 +265,7 @@ port1.postMessage('foobar');
 port1.close();
 ```
 
-### Event: 'message'
+### Event: `'message'`
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@@ -278,7 +278,7 @@ input of [`port.postMessage()`][].
 Listeners on this event will receive a clone of the `value` parameter as passed
 to `postMessage()` and no further arguments.
 
-### port.close()
+### `port.close()`
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@@ -290,7 +290,7 @@ This method can be called when no further communication will happen over this
 The [`'close'` event][] will be emitted on both `MessagePort` instances that
 are part of the channel.
 
-### port.postMessage(value\[, transferList\])
+### `port.postMessage(value[, transferList])`
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@@ -371,7 +371,7 @@ posting without having side effects.
 For more information on the serialization and deserialization mechanisms
 behind this API, see the [serialization API of the `v8` module][v8.serdes].
 
-### port.ref()
+### `port.ref()`
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@@ -384,7 +384,7 @@ If listeners are attached or removed using `.on('message')`, the port will
 be `ref()`ed and `unref()`ed automatically depending on whether
 listeners for the event exist.
 
-### port.start()
+### `port.start()`
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@@ -399,7 +399,7 @@ Node.js also diverges in its handling of `.onmessage`. Setting it will
 automatically call `.start()`, but unsetting it will let messages queue up
 until a new handler is set or the port is discarded.
 
-### port.unref()
+### `port.unref()`
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@@ -412,7 +412,7 @@ If listeners are attached or removed using `.on('message')`, the port will
 be `ref()`ed and `unref()`ed automatically depending on whether
 listeners for the event exist.
 
-## Class: Worker
+## Class: `Worker`
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@@ -487,7 +487,7 @@ if (isMainThread) {
 }
 ```
 
-### new Worker(filename\[, options\])
+### `new Worker(filename[, options])`
 
 * `filename` {string} The path to the Worker’s main script. Must be
   either an absolute path or a relative path (i.e. relative to the
@@ -520,7 +520,7 @@ if (isMainThread) {
     will be thrown if the object cannot be cloned (e.g. because it contains
     `function`s).
 
-### Event: 'error'
+### Event: `'error'`
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@@ -530,7 +530,7 @@ added: v10.5.0
 The `'error'` event is emitted if the worker thread throws an uncaught
 exception. In that case, the worker will be terminated.
 
-### Event: 'exit'
+### Event: `'exit'`
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@@ -542,7 +542,7 @@ exited by calling [`process.exit()`][], the `exitCode` parameter will be the
 passed exit code. If the worker was terminated, the `exitCode` parameter will
 be `1`.
 
-### Event: 'message'
+### Event: `'message'`
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@@ -553,15 +553,15 @@ The `'message'` event is emitted when the worker thread has invoked
 [`require('worker_threads').parentPort.postMessage()`][].
 See the [`port.on('message')`][] event for more details.
 
-### Event: 'online'
+### Event: `'online'`
 <!-- YAML
 added: v10.5.0
 -->
 
 The `'online'` event is emitted when the worker thread has started executing
 JavaScript code.
 
-### worker.postMessage(value\[, transferList\])
+### `worker.postMessage(value[, transferList])`
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@@ -573,7 +573,7 @@ Send a message to the worker that will be received via
 [`require('worker_threads').parentPort.on('message')`][].
 See [`port.postMessage()`][] for more details.
 
-### worker.ref()
+### `worker.ref()`
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@@ -583,7 +583,7 @@ Opposite of `unref()`, calling `ref()` on a previously `unref()`ed worker will
 behavior). If the worker is `ref()`ed, calling `ref()` again will have
 no effect.
 
-### worker.stderr
+### `worker.stderr`
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@@ -595,7 +595,7 @@ inside the worker thread. If `stderr: true` was not passed to the
 [`Worker`][] constructor, then data will be piped to the parent thread's
 [`process.stderr`][] stream.
 
-### worker.stdin
+### `worker.stdin`
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@@ -606,7 +606,7 @@ If `stdin: true` was passed to the [`Worker`][] constructor, this is a
 writable stream. The data written to this stream will be made available in
 the worker thread as [`process.stdin`][].
 
-### worker.stdout
+### `worker.stdout`
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@@ -618,7 +618,7 @@ inside the worker thread. If `stdout: true` was not passed to the
 [`Worker`][] constructor, then data will be piped to the parent thread's
 [`process.stdout`][] stream.
 
-### worker.terminate()
+### `worker.terminate()`
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 added: v10.5.0
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@@ -636,7 +636,7 @@ Stop all JavaScript execution in the worker thread as soon as possible.
 Returns a Promise for the exit code that is fulfilled when the
 [`'exit'` event][] is emitted.
 
-### worker.threadId
+### `worker.threadId`
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@@ -647,7 +647,7 @@ An integer identifier for the referenced thread. Inside the worker thread,
 it is available as [`require('worker_threads').threadId`][].
 This value is unique for each `Worker` instance inside a single process.
 
-### worker.unref()
+### `worker.unref()`
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