[svn-r2381] Added line to each HTML doc file noting release number.

In many cases, also updated "Last modified:" date.

doc/html/Debugging.html

@@ -498,6 +498,8 @@ H5E.c:336: warning: trace info was not inserted
 <!-- hhmts start -->
 Last modified:  14 October 1999
 <!-- hhmts end -->
+<br>
+Describes HDF5 Release 1.2.2, June 2000
 
   </body>
 </html>