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

[Jacob Boerema <jboerema src gnome org>]

commit 0cbb8292b3e4d5b94cc3b352f4843df00282f800
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.

 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>