[gimp-help/gimp-help-2-10] docs: fix #256 Section 9 Varying brush size - misses one method

[Jacob Boerema <jboerema src gnome org>]

commit 0d480557508da4fa739999151625e38c6a70d8b2
Author: Jacob Boerema <jgboerema gmail com>
Date:   Fri Jul 30 19:10:50 2021 -0400

    docs: fix #256 Section 9 Varying brush size - misses one method
    
    Actually both the keyboard and mouse shortcuts were missing.
    Besides that I made some other changes (replacing varying by changing).
    
    Now that we have added the shortcuts for both keyboard and mouse I feel
    that the instructions for adding both kinds of shortcuts are a little
    to extensive, but will leave them for now.
    We can probably replace this by links in the manual that explain how to
    change these shortcuts.
    
    (cherry picked from commit 0cbb8292b3e4d5b94cc3b352f4843df00282f800)

 src/using/variable-size-brush.xml | 47 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 41 insertions(+), 6 deletions(-)
---
diff --git a/src/using/variable-size-brush.xml b/src/using/variable-size-brush.xml
index 35bfabe75..606a6f9d3 100644
--- a/src/using/variable-size-brush.xml
+++ b/src/using/variable-size-brush.xml
@@ -2,22 +2,23 @@
 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
                        "http://www.docbook.org/xml/4.3/docbookx.dtd";>
 <!--Version history
-  
+
 -->
 <sect1 id="gimp-using-variable-size-brush">
-  <title>Varying brush size</title>
+  <title>Changing brush size</title>
   <indexterm>
     <primary>Brushes</primary>
-    <secondary>Varying brush size</secondary>
+    <secondary>Changing brush size</secondary>
   </indexterm>
   <para>
-    From <acronym>GIMP</acronym>-2.4, all brushes have a variable size.
+    Since <acronym>GIMP</acronym> 2.4, all brushes have a variable size that
+    can be changed.
   </para>
 
   <sect2 id="gimp-using-variable-size-brush-varying">
-    <title>How to vary the height of a brush</title>
+    <title>How to change the size of a brush</title>
     <para>
-       You can get the brush size varying in three ways:
+       You can change the brush size in several ways:
     </para>
     <orderedlist>
       <listitem>
@@ -37,6 +38,40 @@
           </mediaobject>
         </figure>
       </listitem>
+      <listitem>
+        <para>
+          By using the default shortcut keys for changing a tool's size:
+        </para>
+        <itemizedlist>
+          <listitem><para>
+            Decrease size by 1: <keycombo><keycap>[</keycap></keycombo>
+          </para></listitem>
+          <listitem><para>
+            Increase size by 1: <keycombo><keycap>]</keycap></keycombo>
+          </para></listitem>
+          <listitem><para>
+            Decrease size by 10: <keycombo><keycap>{</keycap></keycombo>
+          </para></listitem>
+          <listitem><para>
+            Increase size by 10: <keycombo><keycap>}</keycap></keycombo>
+          </para></listitem>
+        </itemizedlist>
+      </listitem>
+      <listitem>
+        <para>
+          By using the default mouse scrollwheel actions for changing a tool's size:
+        </para>
+        <itemizedlist>
+          <listitem><para>
+            Decrease size by 1: <keycombo><keycap>Ctrl</keycap><keycap>Alt</keycap>
+            <keycap>Scrollwheel Down</keycap></keycombo>
+          </para></listitem>
+          <listitem><para>
+            Increase size by 1: <keycombo><keycap>Ctrl</keycap><keycap>Alt</keycap>
+            <keycap>Scrollwheel Up</keycap></keycombo>
+          </para></listitem>
+        </itemizedlist>
+      </listitem>
       <listitem>
         <procedure>
           <para>By programming the mouse wheel:</para>