Remove a couple of warrnings and a better comment.

Author: daveverwer

Sources/App/Controllers/Manage/Cognito.swift

@@ -46,7 +46,7 @@ struct Cognito {
             adminClient: true
         )
         req.application.cognito.authenticatable = CognitoAuthenticatable(configuration: awsCognitoConfiguration)
-        try await req.application.cognito.authenticatable.signUp(username: username, password: password, attributes: [:], on:req.eventLoop)
+        _ = try await req.application.cognito.authenticatable.signUp(username: username, password: password, attributes: [:], on:req.eventLoop)
         try awsClient.syncShutdown()
     }
 

Sources/App/Controllers/Manage/LoginController.swift

@@ -27,7 +27,7 @@ enum LoginController {
             case .authenticated(let authenticatedResponse):
                 let user = AuthenticatedUser(accessToken: authenticatedResponse.accessToken!)
                 req.auth.login(user)
-            case .challenged(let challengedResponse): // with the current pool configuration, a challenge response is not expected
+            case .challenged(_): // Cognito is not configured to send challenges, so we should never receive this response.
                 break
             }
             return req.redirect(to: SiteURL.portal.relativeURL(), redirectType: .normal)