[pygtk] Document pango.UNDERLINE_ERROR

[Paul Pogonyshev <paulp src gnome org>]

commit 90cfb3e6694a9d575b8fb2420b1c61fd5d6401a8
Author: Paul Pogonyshev <pogonyshev gmx net>
Date:   Sat May 2 17:11:03 2009 +0300

    Document pango.UNDERLINE_ERROR
    
    Fixes bug #576938.
---
 docs/reference/pygtk-pango-constants.xml |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/docs/reference/pygtk-pango-constants.xml b/docs/reference/pygtk-pango-constants.xml
index b10cafb..57b130d 100644
--- a/docs/reference/pygtk-pango-constants.xml
+++ b/docs/reference/pygtk-pango-constants.xml
@@ -657,6 +657,15 @@ only for underlining single characters, such as for keyboard accelerators.
 portions of text.</simpara>
 	  </listitem>
 	</varlistentry>
+	<varlistentry>
+	  <term><literal>pango.UNDERLINE_ERROR</literal></term>
+	  <listitem>
+	    <simpara>a wavy underline should be drawn below. This underline is typically
+	      used to indicate an error such as a possilble mispelling; in some cases a
+	      contrasting color may automatically be used. This type of underlining is
+	      available since Pango 1.4.</simpara>
+	  </listitem>
+	</varlistentry>
       </variablelist>
 
     </refsect2>