docs: pin the M2 callee stack arithmetic in m2-args

docs/superpowers/plans/2026-11-11-tms34010-m2-ti-abi-and-rom-calls.md

@@ -129,10 +129,14 @@ entry:
   ret i32 %r
 }
 ; CHECK-LABEL: _add2:
+; CHECK: SETF 32, 0, 1
+; CHECK: MOVE A13, -*SP, 1
 ; CHECK-DAG: MOVE A13, A{{[0-9]+}}
 ; CHECK-DAG: ADDI -32, A{{[0-9]+}}
 ; CHECK-DAG: ADDI -64, A{{[0-9]+}}
 ; CHECK: MOVE {{A[0-9]+}}, A8
+; CHECK: MOVE *SP(128), A14, 1
+; CHECK: MOVE *SP+, A13, 1
 ; CHECK: RETS 2
 ```