doc: fix globals.md introduction

Splitting the introduction sentence in two paragraphs so it's
clearer the list of variables only apply to the second sentence.

PR-URL: nodejs#51742
Reviewed-By: Jithil P Ponnan <jithil@outlook.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

Author: aduh95

doc/api/globals.md

@@ -4,9 +4,10 @@
 
 <!-- type=misc -->
 
-These objects are available in all modules. The following variables may appear
-to be global but are not. They exist only in the scope of modules, see the
-[module system documentation][]:
+These objects are available in all modules.
+
+The following variables may appear to be global but are not. They exist only in
+the scope of [CommonJS modules][]:
 
 * [`__dirname`][]
 * [`__filename`][]
@@ -1139,6 +1140,7 @@ added: v18.0.0
 A browser-compatible implementation of [`WritableStreamDefaultWriter`][].
 
 [CommonJS module]: modules.md
+[CommonJS modules]: modules.md
 [ECMAScript module]: esm.md
 [Navigator API]: https://html.spec.whatwg.org/multipage/system-state.html#the-navigator-object
 [RFC 5646]: https://www.rfc-editor.org/rfc/rfc5646.txt
@@ -1206,7 +1208,6 @@ A browser-compatible implementation of [`WritableStreamDefaultWriter`][].
 [`window.navigator`]: https://developer.mozilla.org/en-US/docs/Web/API/Window/navigator
 [buffer section]: buffer.md
 [built-in objects]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
-[module system documentation]: modules.md
 [timers]: timers.md
 [webassembly-mdn]: https://developer.mozilla.org/en-US/docs/WebAssembly
 [webassembly-org]: https://webassembly.org