[gimp-help/gimp-help-2-10] concepts.xml: Updates Resolution section.

[Jacob Boerema <jboerema src gnome org>]

commit 4ce89002cb2b889ae2793ca79b54b0805c3e0727
Author: SilverWoodchuck47 <silverwoodchuck47 yahoo com>
Date:   Mon Jul 12 15:53:34 2021 +0000

    concepts.xml: Updates Resolution section.
    
    (cherry picked from commit 8f49ba3197d62368a8e3e915df7f28a0681b3525)

 src/concepts/concepts.xml | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)
---
diff --git a/src/concepts/concepts.xml b/src/concepts/concepts.xml
index f65db308f..a22843b83 100644
--- a/src/concepts/concepts.xml
+++ b/src/concepts/concepts.xml
@@ -100,27 +100,33 @@
       </term>
       <listitem>
         <para>
-          Digital images comprise of a grid of square elements of varying
-          colors, called pixels. Each image has a pixel size, such as 900
+          Digital images consist of a grid of square pixels.
+          Each image has a size measured in two dimensions, such as 900
           pixels wide by 600 pixels high. But pixels don't have a set size in
           physical space. To set up an image for printing, we use a value
           called resolution, defined as the ratio between an image's size in
           pixels and its physical size (usually in inches) when it is printed
           on paper. Most file formats (but not all) can save this value, which
-          is expressed as ppi &mdash; pixels per inch. When printing a file,
-          the resolution value determines the size the image will have on
+          is expressed as ppi&mdash;pixels per inch. 
+        </para>
+        <para>        
+          When printing a file,
+          the resolution determines the size the image will have on
           paper, and as a result, the physical size of the pixels. The same
           900x600 pixel image may be printed as a small 3x2" card with barely
-          noticeable pixels &mdash; or as a large poster with large, chunky
-          pixels.  Images imported from cameras and mobile devices tend to
-          have a resolution value attached to the file. The value is usually
-          72 or 96ppi. It is important to realize that this value is arbitrary
+          noticeable pixels&mdash;or as a large poster with large, chunky
+          pixels.  
+        </para>
+        <para>
+          Images imported from cameras and mobile devices tend to
+          have a resolution attached to the file. The resolution is usually
+          72 or 96ppi. It is important to realize that this resolution is arbitrary
           and was chosen for historic reasons. You can always change the
-          resolution value inside <acronym>GIMP</acronym> &mdash; this has no
+          resolution with <acronym>GIMP</acronym>&mdash;this has no
           effect on the actual image pixels. Furthermore, for uses such as
-          displaying images on line, on mobile devices, television or video
-          games &mdash; in short, any use that is not print &mdash; the
-          resolution value is meaningless and is ignored, and instead the
+          displaying images online, on mobile devices, television or video
+          games&mdash;in short, any use that is not print&mdash;the
+          resolution value is meaningless and is ignored. Instead, the
           image is usually displayed so that each image pixel conforms to one
           screen pixel.
         </para>