Add __all__ to most modules beginning with 'q', 'r' and 's' (#7364)

stdlib/rlcompleter.pyi

@@ -1,5 +1,7 @@
 from typing import Any
 
+__all__ = ["Completer"]
+
 class Completer:
     def __init__(self, namespace: dict[str, Any] | None = ...) -> None: ...
     def complete(self, text: str, state: int) -> str | None: ...