Docs: Add security warning in remove_query_arg() docblock to make it consistent with add_query_arg().

Props roytanck.
Fixes #57885.
See #56792.


git-svn-id: https://develop.svn.wordpress.org/trunk@55492 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -1196,6 +1196,10 @@ function add_query_arg( ...$args ) {
 /**
  * Removes an item or items from a query string.
  *
+ * Important: The return value of remove_query_arg() is not escaped by default. Output should be
+ * late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting
+ * (XSS) attacks.
+ *
  * @since 1.5.0
  *
  * @param string|string[] $key   Query key or keys to remove.