gpnf-gv-duplicate-child-entries.php: Updated header again.

Author: spivurno

gp-nested-forms/gpnf-gv-duplicate-child-entries.php

@@ -2,5 +2,5 @@
 /**
  * This snippet has graduated from the experimental folder. 🎓
  * You can now find the snippet here:
- * https://github.com/gravitywiz/snippet-library/blob/master/gp-nested-forms/gpnf-duplicate-child-entries-on-parent-duplication.php
+ * https://gravitywiz.com/snippet-library/gpnf-duplicate-child-entries-on-parent-duplication/
  */