* subversion/libsvn_fs_fs/transaction.c,
  subversion/libsvn_fs_x/transaction.c
  (fold_change): Update the doc string, following r1504887 which removed
    the 'copyfrom_cache' parameter.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1541622 13f79535-47bb-0310-9956-ffa450edef68