fix: comment on region

Author: Chase Coalwell

packages/middleware-location-constraint/src/index.ts

@@ -24,6 +24,7 @@ export function locationConstraintMiddleware(
     args: InitializeHandlerArguments<any>
   ): Promise<InitializeHandlerOutput<Output>> => {
     const { CreateBucketConfiguration } = args.input;
+    //After region config resolution, region is a Provider<string>
     const region = await options.region();
     if (
       !CreateBucketConfiguration ||