Rectify the chord in the Symbols Palette.

For the release of the next beta version, I think it would be good to fix the chord showing an example of fretboard diagram in the Symbols Palette.

I guess a C chord was expected. There is obviously a mistake.

We see a C add 4, which is, how to say, unpleasant! Especially in this configuration, with the F on the first string (:

So it is better to give a good example from the beginning :) Thanks.