LSR: add forgotten file.

diff --git a/Documentation/snippets/fretboards-alternate-tables.ly b/Documentation/snippets/fretboards-alternate-tables.ly
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+% Do not edit this file; it is automatically
+% generated from Documentation/snippets/new
+% This file is in the public domain.
+%% Note: this file works from version 2.13.36
+\version "2.13.36"
+
+\header {
+  lsrtags = "fretted-strings"
+
+  texidoc = "
+Alternate fretboard tables can be created.  These would be used in
+order to have alternate fretboards for a given chord.
+
+In order to use an alternate fretboard table, the table must first
+be created.  Fretboards are then added to the table.
+
+The table to be used in displaying predefined fretboards is selected
+by the property @code{\\predefinedDiagramTable}.
+"
+
+  doctitle = "Alternate fretboard tables"
+} % begin verbatim
+
+
+\include "predefined-guitar-fretboards.ly"
+
+#(define custom-fretboard-table-one (make-hash-table 101))
+
+#(define custom-fretboard-table-two (make-hash-table 101))
+
+\storePredefinedDiagram #custom-fretboard-table-one
+                        \chordmode{c}
+                        #guitar-tuning
+                        "3-(;3;5;5;5;3-);"
+
+\storePredefinedDiagram #custom-fretboard-table-two
+                        \chordmode{c}
+                        #guitar-tuning
+                        "x;3;5;5;5;o;"
+
+<<
+  \chords {
+    c1 |
+    c1 |
+    c1
+  }
+  \new FretBoards {
+    \chordmode {
+      \set predefinedDiagramTable = #default-fret-table
+      c1
+      \set predefinedDiagramTable = #custom-fretboard-table-one
+      c1
+      \set predefinedDiagramTable = #custom-fretboard-table-two
+      c1
+    }
+  }
+  \new Staff {
+    \clef "treble_8"
+    \chordmode {
+      c1 |
+      c1 |
+      c1
+    }
+  }
+>>
+