Docs: Add missing @since tag for WP_Theme_JSON_Resolver::remove_json_comments().

Follow-up to [54162].

See #56792.

git-svn-id: https://develop.svn.wordpress.org/trunk@55128 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-theme-json-resolver.php

@@ -373,6 +373,8 @@ class WP_Theme_JSON_Resolver {
 	/**
 	 * When given an array, this will remove any keys with the name `//`.
 	 *
+	 * @since 6.1.0
+	 *
 	 * @param array $input_array The array to filter.
 	 * @return array The filtered array.
 	 */