* subversion/libsvn_fs_fs/cached_data.c
  (svn_fs_fs__rep_chain_length): Explain in more detail why we used a
                                 value of '16' here. No functional change.

* subversion/libsvn_fs_x/cached_data.c
  (svn_fs_x__rep_chain_length): Same.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1628083 13f79535-47bb-0310-9956-ffa450edef68