[gimp-help] Add Image Import & Export. Fix typo

[Julien Hardlin <jhardlin src gnome org>]

commit 58dab01c6836da7ffe8af79eed1acd4e17834e2e
Author: Julien Hardelin <jhardlin orange fr>
Date:   Thu Apr 9 20:38:14 2020 +0200

    Add Image Import & Export. Fix typo

 images/C/preferences/prefs-import-export.png       | Bin 0 -> 121094 bytes
 images/C/preferences/prefs-list.png                | Bin 49312 -> 42123 bytes
 src/filters/blur/median-blur.xml                   |   6 ++--
 src/using/preferences/preferences_introduction.xml |   4 +--
 src/using/preferences/prefs-import-export.xml      |  40 +++++++++++++++++++++
 src/using/preferences/prefs-toolbox.xml            |   2 +-
 6 files changed, 47 insertions(+), 5 deletions(-)
---
diff --git a/images/C/preferences/prefs-import-export.png b/images/C/preferences/prefs-import-export.png
new file mode 100644
index 000000000..25683584d
Binary files /dev/null and b/images/C/preferences/prefs-import-export.png differ
diff --git a/images/C/preferences/prefs-list.png b/images/C/preferences/prefs-list.png
index 99b1f0925..d238ae0de 100644
Binary files a/images/C/preferences/prefs-list.png and b/images/C/preferences/prefs-list.png differ
diff --git a/src/filters/blur/median-blur.xml b/src/filters/blur/median-blur.xml
index 513dc753f..59cbdc46d 100644
--- a/src/filters/blur/median-blur.xml
+++ b/src/filters/blur/median-blur.xml
@@ -241,9 +241,11 @@
         </listitem>
       </varlistentry>
       <varlistentry>
-        <term>Clipping</term>
+        <term>High precision</term>
         <listitem>
-          <xi:include href="../clipping-feature.xml"/>
+          <para>
+            This option avoids clipping and quantization but is slower.
+          </para>
         </listitem>
       </varlistentry>
     </variablelist>
diff --git a/src/using/preferences/preferences_introduction.xml 
b/src/using/preferences/preferences_introduction.xml
index eea4d2c39..a55f2ef05 100644
--- a/src/using/preferences/preferences_introduction.xml
+++ b/src/using/preferences/preferences_introduction.xml
@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.docbook.org/xml/4.3/docbookx.dtd";>
 <!-- section history
-  2017-02-07 J.H: Delete prefs-color-environment.xml. Add 
-                  prefs-system-resources.xml
+  2020-04-09 J.H: Add prefs-import-export.xml
 -->
 <sect1 xmlns:xi="http://www.w3.org/2001/XInclude"; id="gimp-prefs-dialog">
   <title>Preferences Dialog</title>
@@ -47,6 +46,7 @@
   </sect2>
   <xi:include href="prefs-system-resources.xml"/>
   <xi:include href="prefs-color-management.xml"/>
+  <xi:include href="prefs-import-export.xml"/>
   <xi:include href="prefs-tool-options.xml"/>
   <xi:include href="prefs-default-image.xml"/>
   <xi:include href="prefs-default-grid.xml"/>
diff --git a/src/using/preferences/prefs-import-export.xml b/src/using/preferences/prefs-import-export.xml
new file mode 100644
index 000000000..9635a2b94
--- /dev/null
+++ b/src/using/preferences/prefs-import-export.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+                       "http://www.docbook.org/xml/4.3/docbookx.dtd";>
+<!--  section history:
+  2020-04-09 j.h: first version
+-->
+<sect2 id="gimp-prefs-import-export">
+  <title>Image Import and Export</title>
+  <indexterm>
+    <primary>Using</primary>
+    <secondary>Preferences</secondary>
+    <tertiary>Image Import and Export</tertiary>
+  </indexterm>
+  <indexterm>
+    <primary>Image Import and Export</primary>
+  </indexterm>
+
+  <figure>
+    <title>Image Import and Export</title>
+    <mediaobject>
+      <imageobject>
+        <imagedata format="PNG"
+          fileref="images/preferences/prefs-import-export.png"/>
+      </imageobject>
+      <caption>
+        <para>
+          This page lets you customize importing and exporting images.
+        </para>
+      </caption>
+    </mediaobject>
+  </figure>
+
+  <sect3>
+    <title>Options</title>
+    <para>
+      These options are self-explanatory and pop-up helps give some more 
+      information.
+    </para>
+  </sect3>
+</sect2>
diff --git a/src/using/preferences/prefs-toolbox.xml b/src/using/preferences/prefs-toolbox.xml
index 0c3261ef5..14df040a2 100644
--- a/src/using/preferences/prefs-toolbox.xml
+++ b/src/using/preferences/prefs-toolbox.xml
@@ -56,7 +56,7 @@
         <secondary>Active Image Thumbnail</secondary>
       </indexterm>
       <varlistentry>
-        <term>Show GIMP logo (drag-and-drop target</term>
+        <term>Show GIMP logo (drag-and-drop target)</term>
         <listitem>
           <para>
             You can click-drag-and-drop an image from a file browser into