[gnome-builder] plugins/shellcmd: add caption explaining commands to users

[Christian Hergert <chergert src gnome org>]

commit 54f4ae8a36f2c7aed692c1214860523b8a5715d1
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 22 13:00:21 2022 -0700

    plugins/shellcmd: add caption explaining commands to users
    
    This is a new feature and therefore could probably use a bit of guidance
    to the user about how to use it.

 src/plugins/shellcmd/tweaks.ui | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/src/plugins/shellcmd/tweaks.ui b/src/plugins/shellcmd/tweaks.ui
index 06803a7d3..9ad7c6508 100644
--- a/src/plugins/shellcmd/tweaks.ui
+++ b/src/plugins/shellcmd/tweaks.ui
@@ -7,6 +7,15 @@
           <object class="IdeTweaksPage" id="commands_page">
             <property name="title" translatable="yes">Commands</property>
             <property name="icon-name">text-x-script-symbolic</property>
+            <child>
+              <object class="IdeTweaksGroup">
+                <child>
+                  <object class="IdeTweaksCaption">
+                    <property name="text" translatable="yes">Use commands to run build tooling, 
applications, or shell scripts and map them to a keyboard shortcut. They can run from various environments 
such as the build pipeline, runtime environment, or host operating system.</property>
+                  </object>
+                </child>
+              </object>
+            </child>
             <child>
               <object class="IdeTweaksGroup" id="command_create_group">
                 <property name="title" translatable="yes">Commands</property>