pydoc.ispath is a TypeGuard (#8899)

stdlib/pydoc.pyi

@@ -6,6 +6,7 @@ from collections.abc import Callable, Container, Mapping, MutableMapping
 from reprlib import Repr
 from types import MethodType, ModuleType, TracebackType
 from typing import IO, Any, AnyStr, NoReturn, TypeVar
+from typing_extensions import TypeGuard
 
 __all__ = ["help"]
 
@@ -231,5 +232,5 @@ class ModuleScanner:
     ) -> None: ...
 
 def apropos(key: str) -> None: ...
-def ispath(x: Any) -> bool: ...
+def ispath(x: object) -> TypeGuard[str]: ...
 def cli() -> None: ...