Tweak comments.

* subversion/libsvn_client/switch.c
  (switch_internal): Tweak a comment to account for the fact that
    the reporter no longer uses svn_repos_dir_delta2, and to correct
    a variable name.

* subversion/libsvn_client/update.c
  (update_internal): The same.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1481074 13f79535-47bb-0310-9956-ffa450edef68