Networks and Sites: Suggest wp_initialize_site as an alternative for the deprecated wpmu_new_blog action.

The previously suggested alternative, `wp_insert_site`, does not get passed enough arguments and runs before the new site initialization routine is actually executed.

Follow-up to [43654].

Props asaquzzaman, henry.wright, MadtownLems.
Fixes #49612.

git-svn-id: https://develop.svn.wordpress.org/trunk@52816 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/ms-site.php

@@ -136,7 +136,7 @@ function wp_insert_site( array $data ) {
 			'wpmu_new_blog',
 			array( $new_site->id, $user_id, $new_site->domain, $new_site->path, $new_site->network_id, $meta ),
 			'5.1.0',
-			'wp_insert_site'
+			'wp_initialize_site'
 		);
 	}