Update hotkey docs

- Relates #826

spring-shell-docs/modules/ROOT/pages/appendices/tui/viewdev.adoc

@@ -5,6 +5,7 @@
 While a _view_ just need to implement `View` it's usually convenient to just
 use `BoxView` as a parent.
 
+[[register-bindings]]
 == Register Bindings
 
 In an `AbstractView` use variants of _registerKeyBinding_, _registerHotKeyBinding_

spring-shell-docs/modules/ROOT/pages/tui/events/key.adoc

@@ -15,3 +15,7 @@ include::{snippets}/KeyHandlingSnippets.java[tag=sample]
 
 `KeyEvent` is a record containing info about a binding coming out
 from a terminal.
+
+Some views allow you to register hot keys which are processed before
+normal key handling. More about this can be found from
+xref:appendices/tui/viewdev.adoc#register-bindings[Register Bindings].

spring-shell-docs/modules/ROOT/pages/tui/views/menubar.adoc

@@ -14,6 +14,15 @@ Inherits xref:tui/views/box.adoc[].
 └─────────────────────────────┘
 ----
 
+_MenuBarView_ is constructed with instances of _MenuBarItem_. _MenuBarItem_ itself
+takes instances of _MenuItem_. _MenuItem_ can define its style and action.
+_MenuBarItem_ can also define a hot key which is used to active particular menu.
+
+[source, java, indent=0]
+----
+include::{snippets}/MenuBarViewSnippets.java[tag=snippet1]
+----
+
 == Default Bindings
 Default _key bindigs_ are:
 

spring-shell-docs/src/test/java/org/springframework/shell/docs/MenuBarViewSnippets.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.docs;
+
+import org.springframework.shell.component.view.control.MenuBarView;
+import org.springframework.shell.component.view.control.MenuBarView.MenuBarItem;
+import org.springframework.shell.component.view.control.MenuView.MenuItem;
+import org.springframework.shell.component.view.control.MenuView.MenuItemCheckStyle;
+import org.springframework.shell.component.view.event.KeyEvent.Key;
+import org.springframework.shell.component.view.event.KeyEvent.KeyMask;
+
+public class MenuBarViewSnippets {
+
+	class Dump1 {
+
+		@SuppressWarnings("unused")
+		void dump1() {
+			// tag::snippet1[]
+			Runnable quitAction = () -> {};
+			Runnable aboutAction = () -> {};
+			MenuBarView menuBar = MenuBarView.of(
+				MenuBarItem.of("File",
+						MenuItem.of("Quit", MenuItemCheckStyle.NOCHECK, quitAction))
+					.setHotKey(Key.f | KeyMask.AltMask),
+				MenuBarItem.of("Help",
+						MenuItem.of("About", MenuItemCheckStyle.NOCHECK, aboutAction))
+			);
+			// end::snippet1[]
+		}
+
+	}
+}