Pass `$post->ID` to `get_comments_number` filter.

Also fixes indentation and a typo in corresponding filter docs.

see #26240.
Built from https://develop.svn.wordpress.org/trunk@28604


git-svn-id: http://core.svn.wordpress.org/trunk@28428 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment-template.php

@@ -695,10 +695,10 @@ function get_comments_number( $post_id = 0 ) {
 	 *
 	 * @since 1.5.0
 	 *
-	 * @param int         $count   Nnumber of comments a post has.
+	 * @param int $count   Number of comments a post has.
 	 * @param int $post_id Post ID.
 	 */
-	return apply_filters( 'get_comments_number', $count, $post_id );
+	return apply_filters( 'get_comments_number', $count, $post->ID );
 }
 
 /**