Docs: Consistently include an empty line between @since tag and @see, @link, or @global, per the documentation standards.

See #49572.

git-svn-id: https://develop.svn.wordpress.org/trunk@48067 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/category.php

@@ -13,6 +13,7 @@
  * will be returned instead.
  *
  * @since 2.1.0
+ *
  * @see get_terms() Type of arguments that can be changed.
  *
  * @param string|array $args {