Update docstring for __get_prompt_str

Co-authored-by: Chris Eibl <[email protected]>

Author: sergey-miryanov

Lib/_pyrepl/reader.py

@@ -480,7 +480,7 @@ def __get_prompt_str(prompt: object, default_prompt: str) -> str:
         """
         Convert prompt object to string.
 
-        If prompt raise BaseException, MemoryError and SystemError then stop
+        If str(prompt) raises BaseException, MemoryError or SystemError then stop
         the REPL. For other exceptions return default_prompt.
         """
         try: