On the fsx branch: update comment. No functional change.

* subversion/svnadmin/svnadmin.c
  (subcommand_create): say "1.9" for 1.9 changes

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsx@1508050 13f79535-47bb-0310-9956-ffa450edef68