fix test docstring

Author: ashm-dev

Lib/test/test_cmd_line.py

@@ -203,9 +203,10 @@ def test_run_module_bug1764407(self):
 
     @support.cpython_only
     def test_null_byte_in_interactive_mode(self):
-        # gh-140594: heap-buffer-overflow in PyOS_StdioReadline when a NULL
-        # is present in interactive input. The test ensures that feeding a null
-        # byte to the interactive prompt does not crash the interpreter.
+        # gh-140594: Fix a buffer overflow when a single NULL character is read
+        # from standard input in interactive mode. The test ensures that
+        # feeding a null byte to the interactive prompt does not crash
+        # the interpreter.
         proc = spawn_python('-i')
         proc.communicate(b'\x00', timeout=10)
         self.assertEqual(proc.returncode, 0)