positron review: fix ambiguity in "#Rules For Parameters Of Primitive-Type"

quote positron:
"About primitive-type parameters, “The caller has to allocate memory for T”: I disagree.  There is no memory to allocate.  In fact those parameters can live their entire life in registers. On the other hand, the memory pointed by T* needs to be allocated by the caller."

README.md

@@ -168,10 +168,14 @@ Where `T` any of the respective IDL-Types (not their respective c-type, as menti
 
 #### Rules For Parameters Of Primitive-Type
 
-The caller has to allocate memory for `T`.
-For mode `Update`, the callee is allowed to mutate the memory pointed to by `T*`.
 (1) A primitive-type cannot be consumed or produced because it's always statically allocated.
 
+### Update
+
+The caller has to allocate memory for `T*`.   
+The callee is allowed to mutate the memory pointed to by `T*`.   
+The caller is responsible to free the memory pointed to by `T*`.   
+
 #### Rules For Parameters Of Object-Type
 
 ##### Read