Follow-up to r1605068.

* subversion/libsvn_fs_fs/transaction.c
  (rep_write_baton): Add missing "for" in docstring. No functional change.

Found by: stsp

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1605072 13f79535-47bb-0310-9956-ffa450edef68