stdlib: correct many pos-or-kw arg names in dunder methods (#7451)

stdlib/threading.pyi

@@ -169,9 +169,7 @@ class _RLock:
     def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
     def release(self) -> None: ...
     __enter__ = acquire
-    def __exit__(
-        self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
-    ) -> None: ...
+    def __exit__(self, t: type[BaseException] | None, v: BaseException | None, tb: TracebackType | None) -> None: ...
 
 RLock = _RLock
 
@@ -191,9 +189,7 @@ class Condition:
 
 class Semaphore:
     def __init__(self, value: int = ...) -> None: ...
-    def __exit__(
-        self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
-    ) -> None: ...
+    def __exit__(self, t: type[BaseException] | None, v: BaseException | None, tb: TracebackType | None) -> None: ...
     def acquire(self, blocking: bool = ..., timeout: float | None = ...) -> bool: ...
     def __enter__(self, blocking: bool = ..., timeout: float | None = ...) -> bool: ...
     if sys.version_info >= (3, 9):