[gnome-user-docs] Document Alt+F2 command history

[Andre Klapper <aklapper src gnome org>]

commit 453568d706753c9bef90c30c96beb0fcccb273f6
Author: Andre Klapper <a9016009 gmx de>
Date:   Sat Jan 12 15:26:57 2019 +0100

    Document Alt+F2 command history
    
    Fixes #29

 gnome-help/C/shell-apps-open.page          | 1 +
 gnome-help/C/shell-keyboard-shortcuts.page | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/gnome-help/C/shell-apps-open.page b/gnome-help/C/shell-apps-open.page
index 9caee0b0..4fc304ff 100644
--- a/gnome-help/C/shell-apps-open.page
+++ b/gnome-help/C/shell-apps-open.page
@@ -95,6 +95,7 @@ icon to choose a window to focus or get new window. Mention middle-click?</p>
     <keyseq><key>Alt</key><key>F2</key></keyseq> and type
     ‘<cmd>rhythmbox</cmd>’ (without the single-quotes). The name of the app is
     the command to launch the program.</p>
+    <p>Use the arrow keys to quickly access previously run commands.</p>
   </note>
 
 </page>
diff --git a/gnome-help/C/shell-keyboard-shortcuts.page b/gnome-help/C/shell-keyboard-shortcuts.page
index f5a511cf..974c6431 100644
--- a/gnome-help/C/shell-keyboard-shortcuts.page
+++ b/gnome-help/C/shell-keyboard-shortcuts.page
@@ -53,7 +53,8 @@ information on navigating user interfaces with only the keyboard.</p>
   </tr>
   <tr xml:id="alt-f2">
     <td><p><keyseq><key>Alt</key><key>F2</key></keyseq></p></td>
-    <td><p>Pop up command window (for quickly running commands)</p></td>
+    <td><p>Pop up command window (for quickly running commands).</p>
+    <p>Use the arrow keys to quickly access previously run commands.</p></td>
   </tr>
   <tr xml:id="super-tab">
     <td><p><keyseq><key>Super</key><key>Tab</key></keyseq></p></td>