guitar slides snippets in the LSR

[Federico Bruni]

Hi folks

This was reported 10 years ago:
https://lists.nongnu.org/archive/html/bug-lilypond/2014-02/msg00326.html

Now the string numbers have been removed, but there's still a sentence 
to be removed:

"String numbers are necessary for TabStaff because automatic string 
calculations are different for chords and for single notes."


The snippet is not using string numbers, so saying that they are 
necessary doesn't make sense.

Can anybody fix the snippet in the LSR?


Thanks

Federico