pythongh-97956: Mention generate_global_objects.py in AC How-To

Author: sobolevn

Doc/howto/clinic.rst

@@ -539,7 +539,17 @@ Let's dive in!
         };
 
 
-16. Compile, then run the relevant portions of the regression-test suite.
+16. Code generated by Argument Clinic might use ``_Py_ID`` macro inside.
+
+    Sample::
+
+        &_Py_ID(new_unique_py_id)
+
+    It means that you would need to run ``Tools/scripts/generate_global_objects.py``
+    script to generate global string objects for the interpreter.
+
+
+17. Compile, then run the relevant portions of the regression-test suite.
     This change should not introduce any new compile-time warnings or errors,
     and there should be no externally visible change to Python's behavior.