Document the %APPDATA% shortcut on Windows.
Document the %APPDATA% shortcut on Windows.

* doc/book/book/ch06.xml (svn-ch-6-sect-1.1): Add a footnote explaining
  how "%APPDATA%\Subversion" always points to the user config area.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@848005 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion