doc: clarify core modules that can be loaded without a prefix

Refs: nodejs/node#42325

PR-URL: nodejs/node#42753
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Jacob Smith <jacob@frende.me>
Reviewed-By: Mestery <mestery@protonmail.com>

doc/api/modules.md

@@ -331,15 +331,17 @@ described in greater detail elsewhere in this documentation.
 The core modules are defined within the Node.js source and are located in the
 `lib/` folder.
 
-Core modules are always preferentially loaded if their identifier is
-passed to `require()`. For instance, `require('http')` will always
-return the built in HTTP module, even if there is a file by that name.
-
-Core modules can also be identified using the `node:` prefix, in which case
+Core modules can be identified using the `node:` prefix, in which case
 it bypasses the `require` cache. For instance, `require('node:http')` will
 always return the built in HTTP module, even if there is `require.cache` entry
 by that name.
 
+Some core modules are always preferentially loaded if their identifier is
+passed to `require()`. For instance, `require('http')` will always
+return the built-in HTTP module, even if there is a file by that name. The list
+of core modules that can be loaded without using the `node:` prefix is exposed
+as [`module.builtinModules`][].
+
 ## Cycles
 
 <!--type=misc-->
@@ -1088,6 +1090,7 @@ This section was moved to
 [`__dirname`]: #__dirname
 [`__filename`]: #__filename
 [`import()`]: https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#Dynamic_Imports
+[`module.builtinModules`]: module.md#modulebuiltinmodules
 [`module.children`]: #modulechildren
 [`module.id`]: #moduleid
 [`module` core module]: module.md