fixup! fixup! makefiles/modules: Add note regarding 'IS_ACTIVE' macro.

Author: leandrolanzieri

makefiles/modules.inc.mk

@@ -1,7 +1,7 @@
 _ALLMODULES = $(sort $(USEMODULE) $(USEPKG))
 
 # Define MODULE_MODULE_NAME preprocessor macros for all modules.
-# Note: Some modules may be using the 'IS_ACTIVE' macro, defined in
+# Note: Some modules may be using the 'IS_USED' macro, defined in
 # kernel_defines.h, please refer to its documentation if you change the way
 # module macros are defined.
 ED = $(addprefix MODULE_,$(_ALLMODULES))