Merge branch 'release-3.21' into release-3.22

Help/release/3.21.rst

@@ -335,9 +335,9 @@ Changes made since CMake 3.21.0 include the following.
   "Visual Studio 2022" release candidates.  Previously it was based on
   preview versions.
 
-3.21.5
-------
+3.21.5, 3.21.6
+--------------
 
-This version made no changes to documented features or interfaces.
+These versions made no changes to documented features or interfaces.
 Some implementation updates were made to support ecosystem changes
 and/or fix regressions.