Update the release notes draft link for 159

Author: rvandermeulen

app/controllers/relnotes_doc.php

@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 // Link to the current Release Notes draft doc. Update that link every cycle.
-$doc = 'https://docs.google.com/document/d/17aB7a2fDnHSEgcPq-1ibC0euwU_OVsjFyAT8Fk47vmI/edit?usp=sharing';
+$doc = 'https://docs.google.com/document/d/1YXQyrId8Mxcor_6MNvH7MX6KreoaPBFLFf-K1J9RrR8/edit?usp=sharing';
 
 header("Location: $doc", true, 302);
 exit;