slides-in-tablature.ly snippets: string numbers of hided notes are visible

[Federico Bruni]

I've just realized that in this snippet the hidden notes, used to make 
the grace slides, have a string number which is printed (and it shouldn't).
I think that we should just remove /3 from the notes in the grace blocks 
(see file attached).

All the examples in the doc using Staff + TabStaff show the string 
numbers. I don't know if it's desirable, but removing all the string 
numbers in this example putting this in a \layout block wouldn't be 
consistent with the rest of the doc:

\context {
  \Staff
  \override StringNumber #'stencil = ##f
}

Can a LSR editor fix it?
Thanks
--
Federico

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