fix name error in `serve run ...` example (#29038)
fix name error in `serve run ...` example (#29038)

The documentation has wrong examples for serve run that fail because it should be the name of the variable and not the class.
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray