Help/About: Use the new /documentation/ URLs for HelpHub links in WordPress Admin.

As `https://wordpress.org/support/` was redirected to `https://wordpress.org/documentation/`, this changeset replaces various `/support/article/*` links with `/documentation/article/*` to avoid an extra redirect.

This also updates links to Support Forums by replacing `https://wordpress.org/support/` URLs with `https://wordpress.org/support/forums/`.

Props SergeyBiryukov, audrasjb, dhrupo, hasanmisbah, sakibmd, sabernhardt.
See #57726.


git-svn-id: https://develop.svn.wordpress.org/trunk@55412 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/network.php

@@ -645,7 +645,7 @@ define( 'BLOG_ID_CURRENT_SITE', 1 );
 		printf(
 			/* translators: %s: Documentation URL. */
 			__( 'It seems your network is running with Nginx web server. <a href="%s">Learn more about further configuration</a>.' ),
-			__( 'https://wordpress.org/support/article/nginx/' )
+			__( 'https://wordpress.org/documentation/article/nginx/' )
 		);
 		echo '</p></li>';