Add Firestore bulk update python example.

[sorced-jim]

Add Firestore bulk update python example.

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

• firestore/cloud-client/snippets.py:456, tag firestore_data_bulk_writes

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[davidcavazos]

Traceback (most recent call last):
  File "/workspace/firestore/cloud-client/snippets_test.py", line 198, in test_update_data_bulk
    write_results = snippets.update_data_bulk()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/firestore/cloud-client/snippets.py", line 459, in update_data_bulk
    batch = firestore_v1.BulkWriteBatch(db)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'google.cloud.firestore_v1' has no attribute 'BulkWriteBatch'. Did you mean: 'WriteBatch'?

Is this a typo?

[iennae]

This hasn't had any progress for a few months so I'm going to close it out. Please feel free to reopen when there is an update for @daniel-sanche