doc: fix worker.resourceLimits indentation

PR-URL: #30663
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

doc/api/worker_threads.md

@@ -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.resourceLimits
+## worker.resourceLimits
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