fix servehandle docstring for sync/async (#14312)
fix servehandle docstring for sync/async (#14312)


ray-project/ray,ray-project/ray,ray-project/ray,pcmoritz/ray-1,ray-project/ray,ray-project/ray,pcmoritz/ray-1,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray,pcmoritz/ray-1,ray-project/ray,pcmoritz/ray-1