Make arguments like Context.GrobName accessible as symbol lists

Documentation/snippets/making-glissandi-breakable.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 2.15.15
-\version "2.17.5"
+\version "2.17.6"
 
 \header {
   lsrtags = "staff-notation, tweaks-and-overrides"
 
   texidoc = "
 Setting the @code{breakable} property to @code{#t} in combination with
 @code{after-line-breaking} allows a glissando to break if it occurs
 at a line break:
 "
 
   doctitle = "Making glissandi breakable"
 } % begin verbatim
 
 
 glissandoSkipOn = {
-  \override NoteColumn glissando-skip = ##t
-  \override NoteHead transparent = ##t
-  \override NoteHead no-ledgers = ##t
+  \override NoteColumn.glissando-skip = ##t
+  \override NoteHead.transparent = ##t
+  \override NoteHead.no-ledgers = ##t
 }
 
 \relative c'' {
-  \override Glissando breakable = ##t
-  \override Glissando after-line-breaking = ##t
+  \override Glissando.breakable = ##t
+  \override Glissando.after-line-breaking = ##t
   f1\glissando |
   \break
   a4 r2. |
   f1\glissando
   \once \glissandoSkipOn
   \break
   a2 a4 r4 |
 }