Multisite: Add missing documentation for new `$network_id` parameter of `wp_maybe_update_network_site_counts()`.

This was overlooked in [40591].

See #40384.

Built from https://develop.svn.wordpress.org/trunk@40592


git-svn-id: http://core.svn.wordpress.org/trunk@40462 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-functions.php

@@ -2301,6 +2301,8 @@ function wp_update_network_counts( $network_id = null ) {
  *
  * @since 3.7.0
  * @since 4.8.0 The $network_id parameter has been added.
+ *
+ * @param int|null $network_id ID of the network. Default is the current network.
  */
 function wp_maybe_update_network_site_counts( $network_id = null ) {
 	$is_small_network = ! wp_is_large_network( 'sites', $network_id );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40591';
+$wp_version = '4.8-alpha-40592';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.