display.texi (Other Display Specs): Document left-fringe and right-fringe

 display specs.

doc/lispref/ChangeLog

+2010-12-04  Eli Zaretskii  <eliz@gnu.org>
+
+	* display.texi (Other Display Specs): Document left-fringe and
+	right-fringe display specs.
+
 2010-12-01  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* backups.texi (Making Backups):

doc/lispref/display.texi

@@ -3890,6 +3890,13 @@ position as that text.  It is equivalent to using just @var{string},
 but it is done as a special case of marginal display (@pxref{Display
 Margins}).
 
+@item (left-fringe @var{bitmap} @r{[}@var{face}@r{]})
+@itemx (right-fringe @var{bitmap} @r{[}@var{face}@r{]})
+This display specification on any character of a line of text causes
+the specified @var{bitmap} be displayed in the left or right fringes
+for that line.  The optional @var{face} specifies the colors to be
+used for the bitmap.  @xref{Fringe Bitmaps}, for the details.
+
 @item (space-width @var{factor})
 This display specification affects all the space characters within the
 text that has the specification.  It displays all of these spaces