Update Doxyfile to try and remove undocumented variables

docs/Doxyfile

@@ -549,7 +549,7 @@ RESOLVE_UNNAMED_PARAMS = YES
 # section is generated. This option has no effect if EXTRACT_ALL is enabled.
 # The default value is: NO.
 
-HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_MEMBERS     = YES
 
 # If the HIDE_UNDOC_CLASSES tag is set to YES, doxygen will hide all
 # undocumented classes that are normally visible in the class hierarchy. If set