get_iam_policy and set_iam_policy are missing doc strings #1871
Description
Is your feature request related to a problem? Please describe.
I'd like to use table-level IAM with the Google BigQuery client library.
The get_iam_policy and set_iam_policy methods are implemented
but not documented:
https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client
Describe the solution you'd like
In addition to doc strings for the methods, a sample similar to the Java sample at https://cloud.google.com/bigquery/docs/control-access-to-resources-iam#grant_access_to_a_table_or_view would be most welcome.
Describe alternatives you've considered
N/A
Additional context
N/A