NR: add many index entries for snippets

Documentation/notation/pitches.itely

Index: Documentation/notation/pitches.itely
diff --git a/Documentation/notation/pitches.itely b/Documentation/notation/pitches.itely
index 06b9f0c34d857578ceac80908b9d5ba486ead750..4dda4285ce8bb2a9dadcd7e92aa250d9b2c28ad6 100644
--- a/Documentation/notation/pitches.itely
+++ b/Documentation/notation/pitches.itely
@@ -437,9 +437,13 @@ new system:
 
 @snippets
 
+@cindex hiding accidentals, on tied notes at start of system
+@cindex accidental, hiding, on tied notes at start of system
 @lilypondfile[verbatim,quote,texidoc,doctitle,ragged-right]
 {hiding-accidentals-on-tied-notes-at-the-start-of-a-new-system.ly}
 
+@cindex natural sign, extra, preventing
+@cindex extra natural sign, preventing
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {preventing-extra-naturals-from-being-automatically-added.ly}
 
@@ -840,9 +844,12 @@ see @ref{Instrument transpositions}.
 
 @snippets
 
+@cindex transposition, pitches, @q{smart}
+@cindex pitches, @q{smart} transposition
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {transposing-pitches-with-minimum-accidentals-smart-transpose.ly}
 
+
 @seealso
 Notation Reference:
 @ref{Instrument transpositions},
@@ -1275,10 +1282,14 @@ will be smaller than normal.  This behaviour can be overridden.
   c'1
 @end lilypond
 
+
 @snippets
+
+@cindex clef, tweaking properties
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {tweaking-clef-properties.ly}
 
+
 @seealso
 Notation Reference:
 @ref{Mensural clefs},
@@ -1409,11 +1420,15 @@ position.
 \bar "||" \key b \major b' fis' b'2
 @end lilypond
 
+
 @snippets
 
+@cindex key signature, preventing natural signs
+@cindex natural sign, preventing in key signatures
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {preventing-natural-signs-from-being-printed-when-the-key-signature-changes.ly}
 
+@cindex key signature, non-traditional
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {non-traditional-key-signatures.ly}
 
@@ -1470,17 +1485,25 @@ octave for the staff:
 }
 @end lilypond
 
+
 @snippets
 
+@cindex ottava text
+@cindex text, ottavation
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {ottava-text.ly}
 
+@cindex ottava, for single voice
+@cindex voice, with ottavation
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {adding-an-ottava-marking-to-a-single-voice.ly}
 
+@cindex ottava spanner, modify slope
+@cindex slope, ottava spanner, modification
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {modifying-the-ottava-spanner-slope.ly}
 
+
 @seealso
 Music Glossary:
 @rglos{octavation}.
@@ -3029,15 +3052,21 @@ printed if they are not part of the key signature.
 
 @snippets
 
+@cindex ambitus, per voice
+@cindex voice, ambitus
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {adding-ambitus-per-voice.ly}
 
+@cindex ambitus, multiple voices
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {ambitus-with-multiple-voices.ly}
 
+@cindex ambitus, line gap
+@funindex AmbitusLine
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {changing-the-ambitus-gap.ly}
 
+
 @seealso
 Music Glossary:
 @rglos{ambitus}.
@@ -3225,9 +3254,13 @@ font, see @ref{Setting the staff size}.
 
 @snippets
 
+@cindex easy notation, using numbers
+@cindex number, in easy notation
+@funindex Ez_numbers_engraver
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {numbers-as-easy-note-heads.ly}
 
+
 @seealso
 Notation Reference:
 @ref{Setting the staff size}.
@@ -3344,6 +3377,8 @@ major:
 
 @snippets
 
+@cindex note head, Aiken, thin variant
+@cindex Aiken shape note head, thin variant
 @lilypondfile[verbatim,quote,texidoc,doctitle]
 {aiken-head-thin-variant-noteheads.ly}
 
@@ -3352,6 +3387,7 @@ major:
 
 To see all note head styles, see @ref{Note head styles}.
 
+
 @seealso
 Snippets:
 @rlsr{Pitches}.