[Backport branch-8-6] update for 8.6.0-rc1 release#1052

jmckenna merged 1 commit intobranch-8-6MapServer/MapServer-documentation:branch-8-6from

backport-1051-to-branch-8-6MapServer/MapServer-documentation:backport-1051-to-branch-8-6Copy head branch name to clipboard