[gimp-help] doc: Fix #236 title should be Icon Theme instead of Theme.

[Jacob Boerema <jboerema src gnome org>]

commit 29217203d0f5adcb78b6d39a3846bf72b713b75a
Author: Jacob Boerema <jgboerema gmail com>
Date:   Fri May 28 22:36:19 2021 -0400

    doc: Fix #236 title should be Icon Theme instead of Theme.

 src/using/preferences/prefs-icon-theme.xml | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/src/using/preferences/prefs-icon-theme.xml b/src/using/preferences/prefs-icon-theme.xml
index 90650cc56..7389014aa 100644
--- a/src/using/preferences/prefs-icon-theme.xml
+++ b/src/using/preferences/prefs-icon-theme.xml
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" 
+<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
 "http://www.docbook.org/xml/4.5/docbookx.dtd";>
 <!--Section History
   2017-02-21 j.h: created
 -->
 <sect2 id="gimp-prefs-icon-theme">
-  <title>Theme</title>
+  <title>Icon Theme</title>
   <indexterm>
     <primary>Preferences</primary>
     <secondary>Icon Theme</secondary>
@@ -18,15 +18,15 @@
     <title>Icon Theme Preference</title>
     <mediaobject>
       <imageobject>
-        <imagedata fileref="images/preferences/prefs-icon-theme.png" 
+        <imagedata fileref="images/preferences/prefs-icon-theme.png"
 format="PNG"/>
       </imageobject>
     </mediaobject>
   </figure>
-  
+
   <para>
-    This page lets you select a theme for the icons of the GIMP user interface. 
+    This page lets you select a theme for the icons of the GIMP user interface.
     Test them: you will see the result instantly in this preference dialog.
   </para>
-  
+
 </sect2>