NR: Mention standalone accidentals in figuremode

Documentation/notation/chords.itely

 @c -*- coding: utf-8; mode: texinfo; -*-
 @ignore
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 @c \version "2.19.28"
@@ skipping 830 matching lines @@
 
 @lilypond[verbatim,quote,ragged-right]
 \new FiguredBass {
   \figuremode {
     <6 4>2
   }
 }
 @end lilypond
 
 
-Accidentals (including naturals) can be added to figures or printed
-on their own:
+Accidentals (including naturals) may be used for modifying scale steps.
+These are entered by appending @code{+} (for sharps), @code{-} (for flats)
+or @code{!} (for naturals) after the number.  For double accidentals the
+modifier is applied twice.  For the modification of the third step the
+number is often omitted, which can be achieved by using @code{_} instead
+of a number.
 
 @lilypond[verbatim,quote,ragged-right]
 \figures {
   <7! 6+ 4-> <5++> <3--> < _+ > < 7 _!>
 }
 @end lilypond
 
 Augmented and diminished steps can be indicated:
 
 @lilypond[verbatim,quote,ragged-right]
 \figures {
   <6\+ 5/> <7/>
 }
 @end lilypond
 
 A backward slash through a figure (typically used for raised
 sixth steps) can be created:
 
 @lilypond[verbatim,quote,ragged-right]
 \figures {
   <6> <6\\>
 }
 @end lilypond
 
-Vertical spaces and brackets can be included in figures:
+Brackets can be included in figures:
 
 @lilypond[verbatim,quote,ragged-right]
 \figures {
-  <[12 _!] 8 [6  4]>
+  <[12] 8 [6  4]>

[dak, 2016/07/03 21:05:15]

I have no actual clue about figured bass, but do brackets around _single_
numbers make any sense?

 }
 @end lilypond
 
 Any text markup can be inserted as a figure:
 
 @lilypond[verbatim,quote,ragged-right]
 \figures {
   <\markup { \tiny \number 6 \super (1) } 5>
 }
 @end lilypond
@@ skipping 238 matching lines @@
     \repeat unfold 4 { f16. g32 } f8. es16 d8 es
   }
   \figures {
     \bassFigureExtendersOn
     % The extenders are incorrect here, even though the timing is the same
     <6 4->4 <6 4->4
     <5>8. r16 <6>8 <6\! 5->
   }
 >>
 @end lilypond