[gimp-help] Fix docbook xml: only one listitem allowed inside varlistentry.

[Jacob Boerema <jboerema src gnome org>]

commit 7f973445e1f6f277612529dd50d004aa74b48f95
Author: Jacob Boerema <jgboerema gmail com>
Date:   Fri Jun 3 11:32:17 2022 -0400

    Fix docbook xml: only one listitem allowed inside varlistentry.
    
    (cherry picked from commit 1280f11b11ad128712e13733b2e82f8c0bfcd468)

 src/filters/common-features.xml | 56 +++++++++++++++++++++--------------------
 1 file changed, 29 insertions(+), 27 deletions(-)
---
diff --git a/src/filters/common-features.xml b/src/filters/common-features.xml
index af33d521e..4f6328014 100644
--- a/src/filters/common-features.xml
+++ b/src/filters/common-features.xml
@@ -68,33 +68,35 @@
             is available.
           </para>
         </note>
-      </listitem>
-      <listitem>
-        <para>
-          <guilabel>Use the selection as input</guilabel> If this option is
-          selected, the filter only uses pixels inside the selection as
-          input for the filter.
-        </para>
-        <mediaobject>
-          <imageobject>
-            <imagedata format="JPG"
-            fileref="images/filters/use_selection_only.jpg"/>
-          </imageobject>
-        </mediaobject>
-      </listitem>
-      <listitem>
-        <para>
-          <guilabel>Use the entire layer as input</guilabel> If this option
-          is selected, the input of the filter is the entire layer. The
-          ouput will only affect the selection. The layer outside the
-          selection remains unchanged.
-        </para>
-        <mediaobject>
-          <imageobject>
-            <imagedata format="JPG"
-            fileref="images/filters/use_entire_layer.jpg"/>
-          </imageobject>
-        </mediaobject>
+        <itemizedlist>
+          <listitem>
+            <para>
+              <guilabel>Use the selection as input</guilabel> If this option is
+              selected, the filter only uses pixels inside the selection as
+              input for the filter.
+            </para>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="JPG"
+                fileref="images/filters/use_selection_only.jpg"/>
+              </imageobject>
+            </mediaobject>
+          </listitem>
+          <listitem>
+            <para>
+              <guilabel>Use the entire layer as input</guilabel> If this option
+              is selected, the input of the filter is the entire layer. The
+              ouput will only affect the selection. The layer outside the
+              selection remains unchanged.
+            </para>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="JPG"
+                fileref="images/filters/use_entire_layer.jpg"/>
+              </imageobject>
+            </mediaobject>
+          </listitem>
+        </itemizedlist>
       </listitem>
     </varlistentry>