doc: describe using multiple link-module on win

Current description seems to suggest that only one linked-module can be
provided. This modifies the example to show that multiple
inked-modules can be used.

PR-URL: #20774
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

BUILDING.md

@@ -423,8 +423,9 @@ $ ./configure --link-module '/root/myModule.js' --link-module './myModule2.js'
 
 ### Windows
 
-To make `./myCustomModule.js` available via `require('myCustomModule')`.
+To make `./myModule.js` available via `require('myModule')` and
+`./myModule2.js` available via `require('myModule2')`:
 
 ```console
-> .\vcbuild link-module './myCustomModule.js'
+> .\vcbuild link-module './myModule.js' link-module './myModule2.js'
 ```