[gimp-help/gimp-help-2-10] doc: improve introduction.xml a bit

[Jacob Boerema <jboerema src gnome org>]

commit 5b43d2d2445ebfff83a44c7c01081312a6d84004
Author: Jacob Boerema <jgboerema gmail com>
Date:   Thu Jun 24 17:08:59 2021 -0400

    doc: improve introduction.xml a bit
    
    (cherry picked from commit 6a2b5b37f1ad33f120fa81467b50d1391177068c)

 src/introduction.xml | 61 ++++++++++++++++++++++++----------------------------
 1 file changed, 28 insertions(+), 33 deletions(-)
---
diff --git a/src/introduction.xml b/src/introduction.xml
index 28694b6cd..02f1c9a07 100644
--- a/src/introduction.xml
+++ b/src/introduction.xml
@@ -19,25 +19,21 @@
     <secondary>Introduction</secondary>
   </indexterm>
   <para>
-    <acronym>GIMP</acronym> is a multi-platform photo
-    manipulation tool. <acronym>GIMP</acronym> is an acronym for
-    <acronym>GNU</acronym> Image Manipulation Program. The
-    <acronym>GIMP</acronym> is suitable for a variety of image
-    manipulation tasks, including photo retouching, image composition, and
-    image construction.
+    <acronym>GIMP</acronym> is a multi-platform tool to create and edit
+    images of all kinds. <acronym>GIMP</acronym> is an acronym for
+    <acronym>GNU</acronym> Image Manipulation Program.
   </para>
   <para>
     <acronym>GIMP</acronym> has many capabilities. It can be used as a
-    simple paint program, an
-    expert quality photo retouching program, an online batch processing
-    system, a mass production image renderer, an image format converter, etc.
+    simple paint program, an expert quality photo retouching program, a tool
+    to create digital art, an online batch processing system, a mass production
+    image renderer, an image format converter, etc.
   </para>
   <para>
     <acronym>GIMP</acronym> is expandable and extensible. It is designed
-    to be augmented with
-    plug-ins and extensions to do just about anything. The advanced scripting
-    interface allows everything from the simplest task to the most complex
-    image manipulation procedures to be easily scripted.
+    to be augmented with plug-ins and extensions to do just about anything.
+    The advanced scripting interface allows everything from the simplest task
+    to the most complex image manipulation procedures to be easily scripted.
   </para>
   <para>
     One of <acronym>GIMP</acronym>'s strengths is its free availability from
@@ -69,18 +65,17 @@
   <sect2 id="introduction-help">
     <title>The GIMP Help system</title>
     <para>
-      The <acronym>GIMP</acronym> Documentation Team and other
-      users have provided you with the information necessary to understand
-      how to use <acronym>GIMP</acronym>. The User Manual is
-      an important part of this help. The current version is on
-      the web site of the Documentation Team
+      The <acronym>GIMP</acronym> Documentation Team provides the information
+      that tries to help you understand how to use <acronym>GIMP</acronym>.
+      The User Manual is an important part of this help. The latest version is
+      always available on the website of the Documentation Team
       <xref linkend="bibliography-online-gimp-docs"/> in HTML format. The HTML
-      version is also available as context sensitive help (if you installed
-      it) while using <acronym>GIMP</acronym> by pressing the
+      version is also available as context sensitive help (needs to be installed
+      separately) while using <acronym>GIMP</acronym> by pressing the
       <keycap>F1</keycap> key. Help on specific menu items can be accessed
       by pressing the <keycap>F1</keycap> key while the mouse pointer is
-      focused on the menu item. Read on to begin your
-      <acronym>GIMP</acronym> journey.
+      focused on the menu item. Read on to begin your <acronym>GIMP</acronym>
+      journey.
     </para>
   </sect2>
 
@@ -100,50 +95,50 @@
       <listitem>
         <para>
           Tile-based memory management, so image size is limited only by
-          available disk space
+          available disk space.
         </para>
       </listitem>
       <listitem>
         <para>
           Sub-pixel sampling for all paint tools for high-quality
-          anti-aliasing
+          anti-aliasing.
         </para>
       </listitem>
       <listitem>
         <para>
-          Full Alpha channel support for working with transparency
+          Full Alpha channel support for working with transparency.
         </para>
       </listitem>
       <listitem>
-        <para>Layers and channels</para>
+        <para>Layers and channels.</para>
       </listitem>
       <listitem>
         <para>
           A procedural database for calling internal <acronym>GIMP</acronym>
-          functions from external programs, such as Script-Fu
+          functions from external programs, such as Script-Fu.
         </para>
       </listitem>
       <listitem>
-        <para>Advanced scripting capabilities</para>
+        <para>Advanced scripting capabilities.</para>
       </listitem>
       <listitem>
-        <para>Multiple undo/redo (limited only by disk space)</para>
+        <para>Multiple undo/redo (limited only by disk space).</para>
       </listitem>
       <listitem>
         <para>
-          Transformation tools including rotate, scale, shear and flip
+          Transformation tools including rotate, scale, shear and flip.
         </para>
       </listitem>
       <listitem>
         <para>
-         Support for a wide range of file formats, including GIF, JPEG, PNG,
-         XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others
+          Support for a wide range of file formats, including JPEG, PNG, GIF,
+          PSD, DDS, XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others.
         </para>
       </listitem>
       <listitem>
         <para>
           Selection tools, including rectangle, ellipse, free, fuzzy, bezier
-          and intelligent scissors
+          and intelligent scissors.
         </para>
       </listitem>
       <listitem>