Fix some typos in comments.
Fix some typos in comments.

* subversion/libsvn_client/copy.c
  (): Fix typos in comments.

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