doc: fix capitalization in module.md

PR-URL: #54488
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>

doc/api/modules.md

@@ -387,7 +387,7 @@ described in greater detail elsewhere in this documentation.
 The built-in modules are defined within the Node.js source and are located in the
 `lib/` folder.
 
-built-in modules can be identified using the `node:` prefix, in which case
+Built-in 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.