doc: use "JavaScript" instead of "Javascript"

Backport-PR-URL: #19447
PR-URL: #17163
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

README.md

@@ -194,8 +194,8 @@ us a report nonetheless.
 
 - [#14519](https://github.com/nodejs/node/issues/14519): _Internal domain
   function can be used to cause segfaults_. Causing program termination using
-  either the public Javascript APIs or the private bindings layer APIs requires
-  the ability to execute arbitrary Javascript code, which is already the highest
+  either the public JavaScript APIs or the private bindings layer APIs requires
+  the ability to execute arbitrary JavaScript code, which is already the highest
   level of privilege possible.
 
 - [#12141](https://github.com/nodejs/node/pull/12141): _buffer: zero fill

doc/api/n-api.md

@@ -202,7 +202,7 @@ typedef void (*napi_async_complete_callback)(napi_env env,
 ```
 
 ## Error Handling
-N-API uses both return values and Javascript exceptions for error handling.
+N-API uses both return values and JavaScript exceptions for error handling.
 The following sections explain the approach for each case.
 
 ### Return values
@@ -2861,7 +2861,7 @@ Returns `napi_ok` if the API succeeded.
 
 This API allows an add-on author to create a function object in native code.
 This is the primary mechanism to allow calling *into* the add-on's native code
-*from* Javascript.
+*from* JavaScript.
 
 **Note:** The newly created function is not automatically visible from
 script after this call. Instead, a property must be explicitly set on any