improve comment

Author: kumaraditya303

Python/pystate.c

@@ -78,7 +78,8 @@ _Py_thread_local PyThreadState *_Py_tss_tstate = NULL;
    also known as a "gilstate." */
 _Py_thread_local PyThreadState *_Py_tss_gilstate = NULL;
 
-/* The interpreter of the attached thread state. */
+/* The interpreter of the attached thread state,
+   and is same as tstate->interp. */
 _Py_thread_local PyInterpreterState *_Py_tss_interp = NULL;
 
 static inline PyThreadState *