[Documentation] arg::timezone does not work as correct on documentation on TF Google 4.42.0, 4.42.1, 4.43+

[IchiruTake]

According to the test applied on this file [1], the arg::time_zone belongs to the block settings but not setting.sql_server_audit_config block. The misleading placement are found under the documentation from Terraform Google 4.42.0, 4.42.1, and 4.43. I expected this misplacement may come from the portal of Cloud SQL::Create_Instance.
I have re-check the creation and the testing (followed by the .go file) worked.
=> Request to correct the argument's name form

timezone - (Optional) The timezone to be used by the database engine (supported only for SQL Server), in SQL Server timezone format.

to be

time_zone - (Optional) The time zone to be used by the database engine (supported only for SQL Server), in SQL Server time zone format.

Reference:
https://github.com/modular-magician/terraform-provider-google/blob/acb21ee0d5bff50cf94c9b7c63856348a2a1b22c/google/resource_sql_database_instance_test.go

[IchiruTake]

@edwardmedia According to the difference between the documentation and the test, not only the argument's name is incorrect, but also the argument position as well, which is supposed to be in the settings block not the settings.sql_server_audit_config.

But according to the GCP portal, this field is set when creating SQL Server only. This should be fixed as deep inside the source code, this argument is misplaced.

[IchiruTake]

@edwardmedia I think the PR is not correct as well. Following the .go file above (line 1569), it shown that the argument :arg:time_zone is located directly in the settings sub-block, not in the settings.sql_server_audit_config. The two or three PRs above just changed the argument's name. It should migrate this argument (in the documentation) into the settings sub-block.

Expected documentation:

`settings` sub-block supported thee arguments
    :arg:`time_zone`: (Optional) ...

`settings.sql_server_audit_config` sub-block supported thee arguments
    ......

Not

`settings` sub-block supported thee arguments
    ....
`settings.sql_server_audit_config` sub-block supported thee arguments
    :arg:`time_zone`: (Optional) ...

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