Docs: integrations: fix FastAPI link (#1177)

Author: sduthil

docs/index.rst

@@ -30,4 +30,4 @@ Integrations
 * `Graphene-GAE <http://docs.graphene-python.org/projects/gae/en/latest/>`_ (`source <https://github.com/graphql-python/graphene-gae/>`_)
 * `Graphene-Mongo <http://graphene-mongo.readthedocs.io/en/latest/>`_ (`source <https://github.com/graphql-python/graphene-mongo>`_)
 * `Starlette <https://www.starlette.io/graphql/>`_ (`source <https://github.com/encode/starlette>`_)
-* `FastAPI <https://fastapi.tiangolo.com/tutorial/graphql/>`_ (`source <https://github.com/tiangolo/fastapi>`_)
+* `FastAPI <https://fastapi.tiangolo.com/advanced/graphql/>`_ (`source <https://github.com/tiangolo/fastapi>`_)