Fill in release date for 2.16.1

CHANGELOG.txt

@@ -1,8 +1,8 @@
 Changelog
 =========
 
-2.16.1 (xx.xx.xxxx) - IN DEVELOPMENT
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+2.16.1 (11.02.2022)
+~~~~~~~~~~~~~~~~~~~
 
  * Fix: Ensure that correct sidebar submenus open when labels use non-Latin alphabets (Matt Westcott)
  * Fix: Fix issue where invalid bulk action URLs would incorrectly trigger a server error (500) instead of a valid not found (404) (Ihor Marhitych)

docs/releases/2.16.1.rst

@@ -1,6 +1,6 @@
-=============================================
-Wagtail 2.16.1 release notes - IN DEVELOPMENT
-=============================================
+============================
+Wagtail 2.16.1 release notes
+============================
 
 .. contents::
     :local: