docs(bigquery): Update TableResult.getTotalRows() docstring #3785
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After some investigation into Issue #3776, we noticed that getTotalRows() would return 1 for queries that didn't actually return any rows. This docstring explains why the method can potentially return a non-zero value for queries that don't return any rows, such as INSERT, UPDATE, and DELETE.
The reason for this is that the totalRows value can be set to the numDmlAffectedRows in some cases.