* www/merge-tracking/requirements.html   (summary): Renamed the "Show Available Change Sets for Merge"    requirement to "Show Change Sets Available for Merge" for    consistency with its inverse.
* www/merge-tracking/requirements.html
  (summary): Renamed the "Show Available Change Sets for Merge"
   requirement to "Show Change Sets Available for Merge" for
   consistency with its inverse.

  (cherry-picking, manual-merge): Note use case dependency on "Show
   Change Sets Available for Merge".

  (rollback-merge): Note use case dependency on "Show Change Sets
   Available for Merge" and "Show Change Sets Already Merged".

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion