doc: update resource docstrings

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[leahecole]

Are these samples where we have to be using the cloud specific build projects?

[tswast]

@leahecole

Are these samples where we have to be using the cloud specific build projects?

/shrug

They only access public data or data they create themselves as part of the test fixture. They don't rely on any private long-lived data, so should be able to be run anywhere.

[leahecole]

Okee dokes - I double checked and the addition of this env var just opens up the possibility and isn't a commitment. So given the /shrug nature of your response, it should be fine in the context of this PR as is :)

[tswast]

Test failures are confusing

/tmpfs/src/github/python-bigquery-storage/samples/to_dataframe/.nox/py-3-7/lib/python3.7/site-packages/google/cloud/bigquery/magics.py in _make_bqstorage_client(use_bqstorage_api, credentials)
605 try:
--> 606 from google.cloud import bigquery_storage_v1beta1
607 except ImportError as err:
ImportError: cannot import name 'bigquery_storage_v1beta1' from 'google.cloud' (/tmpfs/src/github/python-bigquery-storage/google/cloud/__init__.py)

Looks like this hasn't included the changes from #64

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