Final editorial cleanup

Remove duplicate changelog entry

Change log

Informally....

Merge pull request tlswg#468 from ekr/cookie_for_hrr

Cookie for hrr

Cleanup

Add open issue marker

Minor reference cleanups

Merge pull request tlswg#273 from ekr/issue229_server_configuration_v…

…alid

Don't use ServerConfiguration till it's verified. Fixed tlswg#229

Merge pull request tlswg#221 from davegarrett/patch-1

very trivial fixes