docs(recommender): change requests intersphinx url (via synth)

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/recommender/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:0d2f8d429110aeb8d82df6550ef4ede59d40df9062d260a1580fce688b0512bf
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/recommender/artman_recommender_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/recommender-v1beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/recommender/v1beta1/recommender_service.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/recommender-v1beta1/google/cloud/recommender_v1beta1/proto/recommender_service.proto
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/recommender/v1beta1/recommendation.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/recommender-v1beta1/google/cloud/recommender_v1beta1/proto/recommendation.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/recommender-v1beta1/google/cloud/recommender_v1beta1/proto.
.coveragerc
.flake8
MANIFEST.in
noxfile.py.j2
setup.cfg
Running session blacken
Creating virtual environment (virtualenv) using python3.6 in .nox/blacken
pip install black==19.3b0
black docs google tests noxfile.py setup.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/gapic/enums.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/gapic/recommender_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/gapic/transports/recommender_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/proto/recommendation_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/docs/conf.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/proto/recommender_service_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/gapic/recommender_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/tests/unit/gapic/v1beta1/test_recommender_client_v1beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/proto/recommender_service_pb2.py
reformatted /tmpfs/src/git/autosynth/working_repo/recommender/google/cloud/recommender_v1beta1/proto/recommendation_pb2.py
All done! ✨ 🍰 ✨
15 files reformatted, 5 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.