Small svnadmin --help output fixes.
Small svnadmin --help output fixes.

* subversion/svnserve/svnserve.c
  (svnserve__options): Caching is for FSX as well. Make sure all
                       text fits nicely into 80 columns.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1584358 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion