Docs: Clarify that `is_network_admin()` does not check if the site is a Multisite network; `is_multisite()` should be used for that.

Props svovaf, dilipbheda, tazotodua.
Fixes #47415.
Built from https://develop.svn.wordpress.org/trunk@45672


git-svn-id: http://core.svn.wordpress.org/trunk@45483 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/load.php

@@ -1031,6 +1031,9 @@ function is_blog_admin() {
  * Does not check if the user is an administrator; use current_user_can()
  * for checking roles and capabilities.
  *
+ * Does not check if the site is a Multisite network; use is_multisite()
+ * for checking if Multisite is enabled.
+ *
  * @since 3.1.0
  *
  * @global WP_Screen $current_screen

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45671';
+$wp_version = '5.3-alpha-45672';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.