Update the doxygen configuration file.
Minor updates/fixes to the source documentation.
diff --git a/doxygen/swrast.doxy b/doxygen/swrast.doxy
index 7b38eac..b0ba953 100644
--- a/doxygen/swrast.doxy
+++ b/doxygen/swrast.doxy
@@ -39,7 +39,7 @@
 #---------------------------------------------------------------------------
 # Configuration::addtions related to external references   
 #---------------------------------------------------------------------------
-TAGFILES               = core.tag=../core \
+TAGFILES               = main.tag=../core \
                          math.tag=../math \
                          tnl_dd.tag=../tnl_dd \
                          swrast_setup.tag=../swrast_setup \