The layout of the tooltip is:
"Column 0 value"
"Data Column Name": "Data Column Value"
You can set the formatted value of a cell to override what the API would
normally place there. Ex:
data.setFormattedValue(0, 0 , 'Limousin');
would change 'FR-L' to 'Limousin' in the tooltip. You can use
DataTable#addRow() instead of setValue() as a shortcut:
data.addRow([{v: 'FR-L', f: 'Limousin'}, 200]);
which populates the entire row. Pass it an array with values for each
column in the row, where each value is either the data type appropriate for
that column (string, number, etc) or an object {v: value, f: 'string
formatted value'}.
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