Update doxygen doc to reflet vbo changes.

Update doxygen doc, array_cache no longuer exist,
new shiny vbo modules is there. Tested on unix,
but i think i didn't broke that bat :).

doxygen/swrast_setup.doxy

@@ -45,5 +45,5 @@ TAGFILES               = tnl_dd.tag=../tnl_dd \
                          math.tag=../math \
                          swrast.tag=../swrast \
                          tnl.tag=../tnl \
-                         array_cache.tag=../array_cache
+                         vbo.tag=../vbo
 GENERATE_TAGFILE       = swrast_setup.tag