Fix syntax for overloaded function

Author: adamtheturtle

stubs/docutils/docutils/io.pyi

@@ -109,7 +109,6 @@ class FileOutput(Output):
 
     @overload
     def write(self, data: bytes) -> bytes: ...
-    def write(self, data: str | bytes) -> str | bytes: ...
     def close(self) -> None: ...
 
 class BinaryFileOutput(FileOutput): ...