[gnome-chess] help-overlay.ui: Add new shortcut: F10: Open Menu

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 258db565272fba7a2f735356bfb63a4f0159f9a9
Author: Sabri Ünal <libreajans gmail com>
Date:   Thu Apr 9 16:36:48 2020 +0300

    help-overlay.ui: Add new shortcut: F10: Open Menu
    
    Add missing F10 shortcut to open the menu.

 data/gnome-chess.ui  | 1 +
 data/help-overlay.ui | 7 +++++++
 2 files changed, 8 insertions(+)
---
diff --git a/data/gnome-chess.ui b/data/gnome-chess.ui
index c19f218..deddfc7 100644
--- a/data/gnome-chess.ui
+++ b/data/gnome-chess.ui
@@ -110,6 +110,7 @@
             <property name="visible">True</property>
             <property name="can_focus">True</property>
             <property name="menu-model">app-menu</property>
+            <accelerator key="F10" signal="activate"/>
             <child>
               <object class="GtkImage">
                 <property name="visible">True</property>
diff --git a/data/help-overlay.ui b/data/help-overlay.ui
index 8b9fee5..aad8ff5 100644
--- a/data/help-overlay.ui
+++ b/data/help-overlay.ui
@@ -60,6 +60,13 @@
                 <property name="title" translatable="yes" context="shortcut window">Quit</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">1</property>
+                <property name="accelerator">F10</property>
+                <property name="title" translatable="yes" context="shortcut window">Open menu</property>
+              </object>
+            </child>
           </object>
         </child>
         <child>