Fix typos: termina[ta]te().

stdlib/3.4/asyncio/subprocess.pyi

@@ -32,7 +32,7 @@ class Process:
     @coroutine
     def wait(self) -> int: ...
     def send_signal(self, signal: int) -> None: ...
-    def terminatate(self) -> None: ...
+    def terminate(self) -> None: ...
     def kill(self) -> None: ...
     @coroutine
     def communicate(self, input: bytes = ...) -> Tuple[bytes, bytes]: ...