[Geoserver-devel] Release guide improvements

When doing the GeoTools 15-RC1 / GeoServer 2.9-RC1 release, I ran ito a bunch of places in the release guide that were incomplete or out of date. I have attempted to fix these with the following PRs:

Notable changes:

  • Several old sites have been removed from the announcments section (Anything we haven’t been using for 2+ years).
  • Missing instructions for performing a RC release have been added, such as updating the stable/maintenance links for docs.geoserver.org
  • sed scripts now work on OS X (they still work on linux too)

Feedback/review would be appreciated.

Torben