On the fsfs-improvements branch:  Clarify the meaning of FSFS ID parts.
No functional change.

* subversion/libsvn_fs_fs/id.h
  (svn_fs_fs__id_part_t): improve docstring

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-improvements@1510135 13f79535-47bb-0310-9956-ffa450edef68