gppa-acf-datepicker-comparison.php: Updated snippet URL in header.

Author: sbassah

gp-populate-anything/gppa-acf-datepicker-comparison.php

@@ -2,5 +2,5 @@
 /**
  * This snippet has evolved! 🦄
  * Find the new version of this snippet here:
- * https://github.com/gravitywiz/snippet-library/gp-populate-anything/gppa-post-meta-datepicker-comparison.php
+ * https://github.com/gravitywiz/snippet-library/blob/master/gp-populate-anything/gppa-post-meta-datepicker-comparison.php
  */