[Docs] no-redundant-roles: Adds missing closing square bracket

Author: mikeriley131

docs/rules/no-redundant-roles.md

@@ -9,10 +9,11 @@ The default options for this rule allow an implicit role of `navigation` to be a
 ```js
 {
   'jsx-a11y/no-redundant-roles': [
-  'error',
-  {
-    nav: ['navigation'],
-  },
+    'error',
+    {
+      nav: ['navigation'],
+    },
+  ],
 }
 ```