[PATCH] issue #4135: correct outdated document name in "notes/subversion-design.html"

[[[
   Fix issue #4135: path of "subversion/include/svn_fs.h" is outdated
in "subversion-design"

   * notes/subversion-design.html
             Correct outdated document name "subversion/libsvn_fs/structure"
to "subversion/libsvn_fs_fs/structure".
]]]

Index: notes/subversion-design.html
===================================================================
--- notes/subversion-design.html (revision 1296209)
+++ notes/subversion-design.html (working copy)
@@ -2340,7 +2340,7 @@
       <p>Once you've done this, read Jim Blandy's own structural overview,
         which explains how nodes and revisions are organized (among other
         things) in the filesystem implementation:
- <tt class="filename">subversion/libsvn_fs/structure</tt>.</p>
+ <tt class="filename">subversion/libsvn_fs_fs/structure</tt>.</p>

       <p>Finally, read the well-documented API in
         <tt class="filename">subversion/include/svn_fs.h</tt>.</p>

--
Yunal