Makefile.include: rm deprecated comment on default goal

Makefile.include

@@ -463,8 +463,7 @@ $(CURDIR)/eclipsesym.xml:
 # Export variables used throughout the whole make system:
 include $(RIOTMAKE)/vars.inc.mk
 
-# Include build targets for selected tools after the default RIOT targets have
-# been defined (-> so the `all` will be always the first target)
+# Include build targets for selected tools
 include $(RIOTMAKE)/tools/targets.inc.mk
 
 # Warn if the selected board and drivers don't provide all needed features: