[argparse] Add default value _SubParsersAction.add_parser params (#14429)

Author: donbarbos

stdlib/argparse.pyi

@@ -762,9 +762,9 @@ class _SubParsersAction(Action, Generic[_ArgumentParserT]):
             fromfile_prefix_chars: str | None = ...,
             argument_default: Any = ...,
             conflict_handler: str = ...,
-            add_help: bool = ...,
-            allow_abbrev: bool = ...,
-            exit_on_error: bool = ...,
+            add_help: bool = True,
+            allow_abbrev: bool = True,
+            exit_on_error: bool = True,
             suggest_on_error: bool = False,
             color: bool = False,
             **kwargs: Any,  # Accepting any additional kwargs for custom parser classes
@@ -788,9 +788,9 @@ class _SubParsersAction(Action, Generic[_ArgumentParserT]):
             fromfile_prefix_chars: str | None = ...,
             argument_default: Any = ...,
             conflict_handler: str = ...,
-            add_help: bool = ...,
-            allow_abbrev: bool = ...,
-            exit_on_error: bool = ...,
+            add_help: bool = True,
+            allow_abbrev: bool = True,
+            exit_on_error: bool = True,
             **kwargs: Any,  # Accepting any additional kwargs for custom parser classes
         ) -> _ArgumentParserT: ...
     else:
@@ -811,9 +811,9 @@ class _SubParsersAction(Action, Generic[_ArgumentParserT]):
             fromfile_prefix_chars: str | None = ...,
             argument_default: Any = ...,
             conflict_handler: str = ...,
-            add_help: bool = ...,
-            allow_abbrev: bool = ...,
-            exit_on_error: bool = ...,
+            add_help: bool = True,
+            allow_abbrev: bool = True,
+            exit_on_error: bool = True,
             **kwargs: Any,  # Accepting any additional kwargs for custom parser classes
         ) -> _ArgumentParserT: ...