Bring repos_upgrade_HOWTO into the land of 1.0ness.
Bring repos_upgrade_HOWTO into the land of 1.0ness.

* notes/repos_upgrade_HOWTO
  Make the document recognize that there has been 2 schema changes and
  explain how our compatibility gurantees make this a rare issue going
  forward.



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@849235 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion