Issue #1919184 by nikhilasrani, vijaycs85: Create configuration schemas for menu module.

core/modules/menu/config/schema/menu.schema.yml

-# Schema for configuration files of the menu module.
+# Schema for configuration files of the Menu module.
 
 menu.settings:
   type: mapping
@@ -13,17 +13,3 @@ menu.settings:
     override_parent_selector:
       type: boolean
       label: 'Override parent selector'
-
-menu.menu.*:
-  type: mapping
-  label: 'Menu'
-  mapping:
-    id:
-      type: string
-      label: 'Menu identifier'
-    label:
-      type: string
-      label: 'Menu label'
-    description:
-      type: text
-      label: 'Menu description'

core/modules/system/config/schema/system.schema.yml

@@ -37,3 +37,17 @@ system.maintenance:
     "message":
       type: text
       label: "Message to display when in maintenance mode"
+
+menu.menu.*:
+  type: mapping
+  label: 'Menu'
+  mapping:
+    id:
+      type: string
+      label: 'Menu identifier'
+    label:
+      type: string
+      label: 'Menu label'
+    description:
+      type: text
+      label: 'Menu description'