Speech: fix client_info bug, update docstrings and timeouts.

[dpebot]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/speech/artman_speech_v1p1beta1.yaml.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/speech-v1p1beta1.
synthtool > Running generator for google/cloud/speech/artman_speech_v1.yaml.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/speech-v1.
synthtool > No replacements made in **/gapic/**/*_transport.py for pattern  \= operations_v1\., maybe replacement is not longer needed?
synthtool > No replacements made in **/gapic/*_client.py for pattern \\"(.+?)-\*\\", maybe replacement is not longer needed?
synthtool > Replaced '(^.*$\\n)*' in google/cloud/speech_v1/proto/cloud_speech_pb2.py.
synthtool > Replaced '(^.*$\\n)*' in google/cloud/speech_v1p1beta1/proto/cloud_speech_pb2.py.
synthtool > Replaced 'from google\\.cloud import speech_(.+?)$' in tests/unit/gapic/v1/test_speech_client_v1.py.
synthtool > Replaced 'from google\\.cloud import speech_(.+?)$' in tests/unit/gapic/v1p1beta1/test_speech_client_v1p1beta1.py.
synthtool > Cleaned up 0 temporary directories.

[tseaver]

Includes codegen fix for #5710.