[gimp-help] Sorry, some fixes in xml tags

[Julien Hardlin <jhardlin src gnome org>]

commit 3f258c68949f6010c66e8e79619e4f330f3ae283
Author: Julien Hardelin <jhardlin orange fr>
Date:   Wed Oct 9 20:19:45 2019 +0200

    Sorry, some fixes in xml tags

 src/menus/colors/colortoalpha.xml | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/src/menus/colors/colortoalpha.xml b/src/menus/colors/colortoalpha.xml
index 1ac127b01..7a9d3f45e 100644
--- a/src/menus/colors/colortoalpha.xml
+++ b/src/menus/colors/colortoalpha.xml
@@ -235,12 +235,18 @@
             </caption>
           </mediaobject>
         </figure>
+      </listitem>
+      <listitem>
         <para>
           Uncheck Preview option.
         </para>
+      </listitem>
+      <listitem>
         <para>
           Pick color, here the sky.
         </para>
+      </listitem>
+      <listitem>
         <para>
           Re-check Preview option.
         </para>
@@ -255,6 +261,8 @@
             </para>
           </caption>
         </mediaobject>
+      </listitem>
+      <listitem>
         <para>
           Adapt Transparency and Opacity thresholds proceeding by trial and 
           error.