chore: Update discovery artifacts (#1394)
## Deleted keys were detected in the following stable discovery artifacts:
bigquery v2 https://github.com/googleapis/google-api-python-client/commit/73965daab29cd6ae78004ede62f8c6c80f5587a3
## Discovery Artifact Change Summary:
feat(bigquery): update the api https://github.com/googleapis/google-api-python-client/commit/73965daab29cd6ae78004ede62f8c6c80f5587a3
feat(realtimebidding): update the api https://github.com/googleapis/google-api-python-client/commit/34d5d2606070b0c6fef053d6b88a65be085227b5
diff --git a/docs/dyn/spanner_v1.projects.instances.databases.sessions.html b/docs/dyn/spanner_v1.projects.instances.databases.sessions.html
index 5a34d9d..1cbdde8 100644
--- a/docs/dyn/spanner_v1.projects.instances.databases.sessions.html
+++ b/docs/dyn/spanner_v1.projects.instances.databases.sessions.html
@@ -337,7 +337,7 @@
{ # The response for Commit.
"commitStats": { # Additional statistics about a commit. # The statistics about this Commit. Not returned by default. For more information, see CommitRequest.return_commit_stats.
- "mutationCount": "A String", # The total number of mutations for the transaction. Knowing the `mutation_count` value can help you maximize the number of mutations in a transaction and minimize the number of API round trips. You can also monitor this value to prevent transactions from exceeding the system [limit](http://cloud.google.com/spanner/quotas#limits_for_creating_reading_updating_and_deleting_data). If the number of mutations exceeds the limit, the server returns [INVALID_ARGUMENT](http://cloud.google.com/spanner/docs/reference/rest/v1/Code#ENUM_VALUES.INVALID_ARGUMENT).
+ "mutationCount": "A String", # The total number of mutations for the transaction. Knowing the `mutation_count` value can help you maximize the number of mutations in a transaction and minimize the number of API round trips. You can also monitor this value to prevent transactions from exceeding the system [limit](https://cloud.google.com/spanner/quotas#limits_for_creating_reading_updating_and_deleting_data). If the number of mutations exceeds the limit, the server returns [INVALID_ARGUMENT](https://cloud.google.com/spanner/docs/reference/rest/v1/Code#ENUM_VALUES.INVALID_ARGUMENT).
},
"commitTimestamp": "A String", # The Cloud Spanner timestamp at which the transaction committed.
}</pre>