Add a description to the hook documentation for the `created_$taxonomy` action to clarify the dynamic portion of the hook name.

See #32246.


git-svn-id: https://develop.svn.wordpress.org/trunk@32451 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/taxonomy.php

@@ -3047,6 +3047,8 @@ function wp_insert_term( $term, $taxonomy, $args = array() ) {
 	 * Fires after a new term in a specific taxonomy is created, and after the term
 	 * cache has been cleaned.
 	 *
+	 * The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
+	 *
 	 * @since 2.3.0
 	 *
 	 * @param int $term_id Term ID.