update documentation for get integrated bathy

[SBFRF]

getdatatestbed/getDataFRF.py

Line 2647 in ccd0393

'xbound': = [xmin, xmax] which will truncate the cbathy domain to xmin, xmax (frf

documentation lists xbound and ybound when code refers to xbounds, ybounds

getdatatestbed/getDataFRF.py

Line 2797 in ccd0393

if 'ybounds' in kwargs and np.array(kwargs['ybounds']).size == 2: