Fix type definition of Route.children (#11672)

Author: doytch

contributors.yml

@@ -67,6 +67,7 @@
 - DigitalNaut
 - dmitrytarassov
 - dokeet
+- doytch
 - Drishtantr
 - edwin177
 - eiffelwong1

docs/route/route.md

@@ -70,7 +70,7 @@ Neither style is discouraged and behavior is identical. For the majority of this
 interface RouteObject {
   path?: string;
   index?: boolean;
-  children?: React.ReactNode;
+  children?: RouteObject[];
   caseSensitive?: boolean;
   id?: string;
   loader?: LoaderFunction;