Docs: Add variable to @param entry for whitelist_options filter.

Props keesiemeijer.
Fixes #39477.

git-svn-id: https://develop.svn.wordpress.org/trunk@39708 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/options.php

@@ -140,7 +140,7 @@ if ( !is_multisite() ) {
  *
  * @since 2.7.0
  *
- * @param array White list options.
+ * @param array $whitelist_options White list options.
  */
 $whitelist_options = apply_filters( 'whitelist_options', $whitelist_options );