Fix typos in local variable names and comments.

* subversion/libsvn_fs_fs/lock.c,
  subversion/libsvn_fs_x/lock.c
  (svn_fs_fs__lock, svn_fs_fs__unlock,
   svn_fs_x__lock, svn_fs_x__unlock): s/cannonical/canonical/.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1584615 13f79535-47bb-0310-9956-ffa450edef68