Docs: Add a missing notation for the `$context` parameter in the DocBlock for `_nx_noop()`.

See #32246.


git-svn-id: https://develop.svn.wordpress.org/trunk@36012 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/l10n.php

@@ -445,6 +445,7 @@ function _n_noop( $singular, $plural, $domain = null ) {
  *
  * @param string $singular Singular form to be localized.
  * @param string $plural   Plural form to be localized.
+ * @param string $context  Context information for the translators.
  * @param string $domain   Optional. Text domain. Unique identifier for retrieving translated strings.
  *                         Default null.
  * @return array {