fitData does not make it clear that it includes headers

[agileminor]

Website Page
A link to the page with the issue

Describe the issue
The description of fitData layout says "By default Tabulator will use the fitData layout mode, which will resize the tables columns to fit the data held in each column, unless you specify a width or minWidth."

This does not state that fitData also includes the header text in the column sizing, since the column header is not data in the column.

Suggested fix would be: "By default Tabulator will use the fitData layout mode, which will resize the tables columns to fit the data held in each column (including header text), unless you specify a width or minWidth."

I've also created a feature request to allow for a way to not include header text in fitData.