Empty bins treatment when fitting

I’d like to propose that the description of how the “empty bins” are treated in the fit is changed:
[url]Reading Histogram, Histogram drawing Empty
Some relevant posts:
[url]Reading Histogram, Histogram drawing Empty
[url]Reading Histogram, Histogram drawing Empty
[url]Empty bins in likelihood fits?

I have updated the doc in TH1::Fit

See the changes in root.cern.ch/viewvc/trunk/hist/h … hrev=46104

Thank you for the feedback

Lorenzo