Twenty Nineteen: Add missing @since tag for twentynineteen_scripts().

Follow-up to [43808].

Props viralsampat, vladimiraus, mukesh27.
Fixes #63692.

git-svn-id: https://develop.svn.wordpress.org/trunk@60495 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-content/themes/twentynineteen/functions.php

@@ -250,7 +250,9 @@ function twentynineteen_content_width() {
 add_action( 'after_setup_theme', 'twentynineteen_content_width', 0 );
 
 /**
- * Enqueue scripts and styles.
+ * Enqueues scripts and styles.
+ *
+ * @since Twenty Nineteen 1.0
  */
 function twentynineteen_scripts() {
 	wp_enqueue_style( 'twentynineteen-style', get_stylesheet_uri(), array(), wp_get_theme()->get( 'Version' ) );