Make arguments like Context.GrobName accessible as symbol lists

Documentation/snippets/defining-predefined-fretboards-for-other-instruments.ly

 %% DO NOT EDIT this file manually; it is automatically
 %% generated from LSR http://lsr.dsi.unimi.it
 %% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
 %% and then run scripts/auxiliar/makelsr.py
 %%
 %% This file is in the public domain.
-\version "2.17.0"
+\version "2.17.6"
 
 \header {
   lsrtags = "fretted-strings"
 
   texidoc = "
 Predefined fret diagrams can be added for new instruments in addition
 to the standards used for guitar.  This file shows how this is done by
 defining a new string-tuning and a few predefined fretboards for the
 Venezuelan cuatro.
 
@@ skipping 69 matching lines @@
       }
       \relative c'' {
         \primeros
       }
     }
 
     \new FretBoards {
       \set Staff.stringTunings = #cuatroTuning
 %      \override FretBoard
 %        #'(fret-diagram-details string-count) = #'4
-      \override FretBoard
-        #'(fret-diagram-details finger-code) = #'in-dot
+      \override FretBoard.fret-diagram-details.finger-code = #'in-dot
       \primeros
     }
 
     \new TabStaff \relative c'' {
       \set TabStaff.stringTunings = #cuatroTuning
       \primeros
     }
 
   >>
 
   \layout {
     \context {
       \Score
-      \override SpacingSpanner
-        #'base-shortest-duration = #(ly:make-moment 1 16)
+      \override SpacingSpanner.base-shortest-duration = #(ly:make-moment 1 16)
     }
   }
   \midi { }
 }