[tablatures] DADGAD tuning: error in 3rd string

["Federico Bruni" <brunology@xxxxxxx>]

Hi,

today while writing a DADGAD piece I've realized that the definition of DADGAD tuning in tablature.scm is not correct (and I suspect it's my fault, because I asked Marc to include it and probably I did not check the definition).

So please change this:

(define-public guitar-dadgad-tuning '(2 -3 -7 -10 -15 -22))

into:

(define-public guitar-dadgad-tuning '(2 -3 -5 -10 -15 -22))

Thanks!

Federico