Fill in release date for 2.15.2

CHANGELOG.txt

@@ -47,7 +47,7 @@ Changelog
  * Fix: Ensure that programmatic page moves are correctly logged as 'move' and not 'reorder' in some cases (Andy Babic)
 
 
-2.15.2 (xx.xx.xxxx) - IN DEVELOPMENT
+2.15.2 (18.01.2022)
 ~~~~~~~~~~~~~~~~~~~
 
  * Fix: CVE-2022-21683 - Comment reply notifications sent to incorrect users (Ihor Marhitych, Jacob Topp-Mugglestone)

docs/releases/2.15.2.rst

@@ -1,6 +1,6 @@
-=============================================
-Wagtail 2.15.2 release notes - IN DEVELOPMENT
-=============================================
+============================
+Wagtail 2.15.2 release notes
+============================
 
 .. contents::
     :local: