docopt: add exception types (#9839)

stubs/docopt/docopt.pyi

@@ -1,12 +1,18 @@
 from _typeshed import Incomplete
 from collections.abc import Iterable
-from typing import Any
+from typing import Any, ClassVar
 from typing_extensions import TypeAlias
 
 __version__: str
 
 _Argv: TypeAlias = Iterable[str] | str
 
+class DocoptLanguageError(Exception): ...
+
+class DocoptExit(SystemExit):
+    usage: ClassVar[str]
+    def __init__(self, message: str = "") -> None: ...
+
 def printable_usage(doc: str) -> str: ...
 def docopt(
     doc: str, argv: _Argv | None = ..., help: bool = ..., version: Incomplete | None = ..., options_first: bool = ...