Fix Auth sample code for signing out (#137)

* Fix Auth code example for sign out

Author: fanky10

README.md

@@ -81,10 +81,10 @@ Please fill out either the individual or corporate Contributor License Agreement
 (CLA).
 
   * If you are an individual writing original source code and you're sure you
-    own the intellectual property, then you'll need to sign an 
+    own the intellectual property, then you'll need to sign an
     [individual CLA](https://developers.google.com/open-source/cla/individual).
   * If you work for a company that wants to allow you to contribute your work,
-    then you'll need to sign a 
+    then you'll need to sign a
     [corporate CLA](https://developers.google.com/open-source/cla/corporate).
 
 Follow either of the two links above to access the appropriate CLA and
@@ -101,4 +101,4 @@ accept your pull requests.
 1. Ensure that your code adheres to the existing style of the library to which
    you are contributing.
 1. Ensure that your code has an appropriate set of unit tests which all pass.
-1. Submit a pull request and cc @puf or @mcdonamp
+1. Submit a pull request and cc @puf or @mcdonamp

auth/README.md

@@ -211,12 +211,12 @@ public void onClick(View v) {
   if (v.getId() == R.id.sign_out) {
       AuthUI.getInstance(this)
           .signOut(this)
-          .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
-            public void onComplete(@NonNull Task<AuthResult> task) {
+          .addOnCompleteListener(new OnCompleteListener<Void>() {
+            public void onComplete(@NonNull Task<Void> task) {
               // user is now signed out
               startActivity(new Intent(MyActivity.this, SignInActivity.class));
               finish();
-            });
+            }
           });
   }
 }