docs(samples): table variable fix

[adhiggs]

Updated table variable in "# Print row data in tabular format." to point at the correct table_id.

Fixes#1286

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[adhiggs]

Not sure how to get these checks to pass. Thoughts?
(And thanks for the assist so far!)

[steffnay]

Hey, @adhiggs, the Client.list_rows method accepts type Union[Table, TableListItem, TableReference, str] for this parameter, so I am not recognizing the reason for this change.

[adhiggs]

Hi @steffnay, looping you in on bugs related, stay tuned.

[Vadoid]

Hi @steffnay this change is for clarity and consistency. In other code samples in https://cloud.google.com/bigquery/docs/samples/bigquery-browse-table the table variable passed to methods is 'table_id', except for the last example under "# Print row data in tabular format." where it's 'table', so the last code block wouldn't run while table variable is defined as 'table_id'.

[adhiggs]

Hi team! Is there anything blocking this item from being merged in?