docs(aria/menu): separate menubar examples (#32476)

Author: wagnermaciel

src/components-examples/aria/menu/BUILD.bazel

@@ -13,6 +13,7 @@ ng_project(
         "//:node_modules/@angular/core",
         "//src/aria/menu",
         "//src/cdk/a11y",
+        "//src/cdk/overlay",
     ],
 )
 

src/components-examples/aria/menu/index.ts

@@ -1,6 +1,3 @@
-export {MenuBarExample} from './menu-bar/menu-bar-example';
-export {MenuBarRTLExample} from './menu-bar-rtl/menu-bar-rtl-example';
-export {MenuBarDisabledExample} from './menu-bar-disabled/menu-bar-disabled-example';
 export {MenuContextExample} from './menu-context/menu-context-example';
 export {MenuTriggerExample} from './menu-trigger/menu-trigger-example';
 export {MenuTriggerDisabledExample} from './menu-trigger-disabled/menu-trigger-disabled-example';