Minor release note fixes and additions

git-svn-id: https://katfs.kat.ac.za/svnDS/code/katcp-python/branches/katcpv5@16237 b56c7a7d-ac47-0410-a905-b6f7de78896a
Merge trunk to katcpv5 branch for katcp-python

git-svn-id: https://katfs.kat.ac.za/svnDS/code/katcp-python/branches/katcpv5@16370 b56c7a7d-ac47-0410-a905-b6f7de78896a
Merge branch 'svn-katcpv5' of github.com:ska-sa/katcp-python into svn-katcpv5