Issue 3013: Amend \overrideProperty example

It has been overlooked by convert-ly due to interspersed comments, and
it could make use of a subproperty override (which is supported by
\overrideProperty by now).

diff --git a/Documentation/extending/programming-interface.itely b/Documentation/extending/programming-interface.itely
index 53134bbd8298b66f6404aa0ab09ca02d1aa7b291..0c1601f50f1c09d46dee9a2cdb52d67eb05d18b5 100644 (file)
--- a/Documentation/extending/programming-interface.itely
+++ b/Documentation/extending/programming-interface.itely
@@ -1281,9 +1281,10 @@ and @code{PaperColumn}.  They can be changed with the
 
 @example
 \overrideProperty
-Score.NonMusicalPaperColumn  % Grob name
-#'line-break-system-details     % Property name
-#'((next-padding . 20))         % Value
+Score.NonMusicalPaperColumn       % Grob name
+  . line-break-system-details     % Property name
+  . next-padding                  % Optional subproperty name
+  #20                             % Value
 @end example
 
 Note, however, that @code{\override}, applied to