bpo-40268: Remove a few pycore_pystate.h includes (GH-19510)

diff --git a/Objects/genobject.c b/Objects/genobject.c
index d3455f8..b1a749d 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -1,9 +1,9 @@
 /* Generator object implementation */
 
 #include "Python.h"
-#include "pycore_ceval.h"   /* _PyEval_EvalFrame() */
+#include "pycore_ceval.h"     // _PyEval_EvalFrame()
 #include "pycore_object.h"
-#include "pycore_pystate.h"
+#include "pycore_pystate.h"   // _PyThreadState_GET()
 #include "frameobject.h"
 #include "structmember.h"
 #include "opcode.h"