Explain how SHM limitations force us to store the revprop generation in disk and why that code is safe. Docstring improvement only.
Explain how SHM limitations force us to store the revprop generation in disk
and why that code is safe. Docstring improvement only.

* subversion/libsvn_fs_fs/fs_fs.c
  (revprop caching): add technical background info

Suggested by: gstein

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