release.py: Make the write-news command use the proper download anchor as well.

* tools/dist/release.py:
  (write_news): Provided an anchor to the template.

* tools/dist/templates/rc-news.ezt
  tools/dist/templates/stable-news.ezt: Use the anchor.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1596070 13f79535-47bb-0310-9956-ffa450edef68