Make arguments like Context.GrobName accessible as symbol lists

Documentation/snippets/using-a-tick-as-the-breath-mark-symbol.ly

 % DO NOT EDIT this file manually; it is automatically
 % generated from Documentation/snippets/new
 % Make any changes in Documentation/snippets/new/
 % and then run scripts/auxiliar/makelsr.py
 %
 % This file is in the public domain.
 %% Note: this file works from version 2.17.4
-\version "2.17.4"
+\version "2.17.6"
 
 \header {
   lsrtags = "expressive-marks"
 
   texidoc = "
 Vocal and wind music frequently uses a tick mark as a breathing sign.  This
 indicates a breath that subtracts a little time from the previous note rather
 than causing a short pause, which is indicated by the comma breath mark.  The
 mark can be moved up a little to take it away from the stave.
 "
   doctitle = "Using a tick as the breath mark symbol"
 } % begin verbatim
 
 
 \relative c'' {
   c2
   \breathe
   d2
-  \override BreathingSign #'Y-offset = #2.6
-  \override BreathingSign
-    #'text = \markup { \musicglyph #"scripts.tickmark" }
+  \override BreathingSign.Y-offset = #2.6
+  \override BreathingSign.text = \markup { \musicglyph #"scripts.tickmark" }
   c2
   \breathe
   d2
 }