Docs: Remove duplicate text for `is_main_site()` parameter.

Props Kenshino.
Fixes #37241.

Built from https://develop.svn.wordpress.org/trunk@37932


git-svn-id: http://core.svn.wordpress.org/trunk@37873 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -4233,7 +4233,6 @@ function wp_suspend_cache_invalidation( $suspend = true ) {
  * @global object $current_site
  *
  * @param int $site_id Optional. Site ID to test. Defaults to current site.
- *                     Defaults to current site.
  * @return bool True if $site_id is the main site of the network, or if not
  *              running Multisite.
  */

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta1-37931';
+$wp_version = '4.6-beta1-37932';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.