address PR feedback

Author: lahirumaramba

src/app/firebase-namespace.ts

@@ -279,8 +279,6 @@ export class FirebaseNamespace {
     return Object.assign(fn, { AppCheck: appCheck });
   }
 
-
-
   // TODO: Change the return types to app.App in the following methods.
 
   /**
@@ -399,8 +397,6 @@ function extendApp(app: AppCore): App {
     return fn(app);
   };
 
-
-
   (result as any).__extended = true;
   return result;
 }

src/phone-number-verification/token-verifier.ts

@@ -31,8 +31,8 @@ export class PhoneNumberTokenVerifier {
 
   constructor(
     jwksUrl: string,
-    private issuer: string,
-    private tokenInfo: FirebasePhoneNumberTokenInfo,
+    private readonly issuer: string,
+    private readonly tokenInfo: FirebasePhoneNumberTokenInfo,
     private readonly app: App
   ) {