Docs: Add missing @since tags for wp_targeted_link_rel() and wp_targeted_link_rel_callback().

See #43187, #46543.

git-svn-id: https://develop.svn.wordpress.org/trunk@45163 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/formatting.php

@@ -3032,6 +3032,8 @@ function wp_rel_nofollow_callback( $matches ) {
 /**
  * Adds rel noreferrer and noopener to all HTML A elements that have a target.
  *
+ * @since 5.1.0
+ *
  * @param string $text Content that may contain HTML A elements.
  * @return string Converted content.
  */
@@ -3050,6 +3052,8 @@ function wp_targeted_link_rel( $text ) {
  * Will not duplicate existing noreferrer and noopener values
  * to prevent from invalidating the HTML.
  *
+ * @since 5.1.0
+ *
  * @param array $matches Single Match
  * @return string HTML A Element with rel noreferrer noopener in addition to any existing values
  */