Expand and correct a few code comments after Karl's review of r11211.
Expand and correct a few code comments after Karl's review of r11211.

* subversion/mod_dav_svn/liveprops.c
  (dav_svn_insert_prop, dav_svn_get_last_modified_time): Just do it.

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