Clarify using multiple macros for specialization purposes is fine!

Co-authored-by: Lukas Wirth <[email protected]>

Author: PLeVasseur

src/coding-guidelines/macros.rst

@@ -34,7 +34,7 @@ Macros
       where we have unique behavior intended for a particular expression.
 
       If needing to specialize logic within the macro based on a particular
-      expression's value, it is better to not use a declarative macro.
+      expression's value, it is better to not use a declarative macro with multiple rules.
 
    .. non_compliant_example::
       :id: non_compl_ex_5vK0CCmePkef