Make arguments like Context.GrobName accessible as symbol lists

Documentation/notation/keyboards.itely

 @c -*- coding: utf-8; mode: texinfo; -*-
 @ignore
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-@c \version "2.16.0"
+@c \version "2.17.6"
 
 @node Keyboard and other multi-staff instruments
 @section Keyboard and other multi-staff instruments
 
 @lilypondfile[quote]{keyboard-headword.ly}
 
 This section discusses several aspects of music notation that are
 unique to keyboard instruments and other instruments notated on
 many staves, such as harps and vibraphones.  For the purposes of
 this section this entire group of multi-staff instruments is called
@@ skipping 178 matching lines @@
 @cindex cross-staff collisions
 @cindex collisions, cross-staff voices
 
 Overlapping notation can result when voices cross staves:
 
 @lilypond[verbatim,quote]
 \new PianoStaff <<
   \new Staff = "up" {
     \voiceOne
     % Make space for fingering in the cross-staff voice
-    \once\override DynamicLineSpanner #'staff-padding = #3.4
+    \once\override DynamicLineSpanner.staff-padding = #3.4
     e''2\p\< d''\>
     c''1\!
   }
   \new Staff = "down" <<
     {
       \clef bass
       s4. e,8\rest g,2\rest
       c1
     } \\ {
       c8\( g c'
@@ skipping 440 matching lines @@
 The @code{\harp-pedal} command accepts a string of characters, where
 @code{^} is the highest pedal position (flattened pitch), @code{-} is
 the middle pedal position (natural pitch), @code{v} is the lowest pedal
 position (sharpened pitch), and @code{|} is the divider.  A prefixed
 @code{o} will circle the following pedal symbol.
 
 @seealso
 Notation Reference:
 @ref{Text scripts},
 @ref{Instrument Specific Markup}.