Code Standards: Correct @since reference in get_user().

Change `@since` from 6.7 to 6.7.0, per coding standards. Follow-up to [59111].

Props joedolson, peterwilsoncc.
See #35124.

git-svn-id: https://develop.svn.wordpress.org/trunk@59112 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/user.php

@@ -778,7 +778,7 @@ function delete_user_option( $user_id, $option_name, $is_global = false ) {
 /**
  * Retrieves user info by user ID.
  *
- * @since 6.7
+ * @since 6.7.0
  *
  * @param int $user_id User ID.
  *