Docs: Improve various globals documentation, as per docblock standards.

Props upadalavipul, audrasjb, shailu25, viralsampat.
Fixes #59255.
See #59651.





git-svn-id: https://develop.svn.wordpress.org/trunk@57370 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rss.php

@@ -631,6 +631,9 @@ function _response_to_rss ($resp) {
  * Set up constants with default values, unless user overrides.
  *
  * @since 1.5.0
+ * 
+ * @global string $wp_version The WordPress version string.
+ * 
  * @package External
  * @subpackage MagpieRSS
  */