Add __all__ for modules beginning with 'u', 'x', 'w' and 'z' (#7374)

stdlib/urllib/robotparser.pyi

@@ -1,7 +1,9 @@
 import sys
 from typing import Iterable, NamedTuple
 
-class _RequestRate(NamedTuple):
+__all__ = ["RobotFileParser"]
+
+class RequestRate(NamedTuple):
     requests: int
     seconds: int
 
@@ -14,6 +16,6 @@ class RobotFileParser:
     def mtime(self) -> int: ...
     def modified(self) -> None: ...
     def crawl_delay(self, useragent: str) -> str | None: ...
-    def request_rate(self, useragent: str) -> _RequestRate | None: ...
+    def request_rate(self, useragent: str) -> RequestRate | None: ...
     if sys.version_info >= (3, 8):
         def site_maps(self) -> list[str] | None: ...