Fix links in auth readme

Author: mkow

auth/testapp/readme.md

@@ -58,7 +58,7 @@ Building and Running the testapp
       enable "Anonymous". This will allow the testapp to use email accounts and
       anonymous sign-in.
   - Download the Firebase C++ SDK linked from
-    [https://firebase.google.com/docs/cpp/setup]() and unzip it to a
+    <https://firebase.google.com/docs/cpp/setup> and unzip it to a
     directory of your choice.
   - Add the following frameworks from the Firebase C++ SDK to the project:
     - frameworks/ios/universal/firebase.framework
@@ -119,7 +119,7 @@ Building and Running the testapp
     - For further details please refer to the
       [general instructions for setting up an Android app with Firebase](https://firebase.google.com/docs/android/setup).
   - Download the Firebase C++ SDK linked from
-    [https://firebase.google.com/docs/cpp/setup]() and unzip it to a
+    <https://firebase.google.com/docs/cpp/setup> and unzip it to a
     directory of your choice.
   - Configure the location of the Firebase C++ SDK by setting the
     firebase\_cpp\_sdk.dir Gradle property to the SDK install directory.
@@ -154,7 +154,7 @@ Building and Running the testapp
       file into a `google-services-desktop.json` file, which can then be
       placed in the root directory of the testapp.
   - Download the Firebase C++ SDK linked from
-    [https://firebase.google.com/docs/cpp/setup]() and unzip it to a
+    <https://firebase.google.com/docs/cpp/setup> and unzip it to a
     directory of your choice.
   - Configure the testapp with the location of the Firebase C++ SDK.
     This can be done a couple different ways (in highest to lowest priority):
@@ -185,7 +185,7 @@ Building and Running the testapp
 Support
 -------
 
-[https://firebase.google.com/support/]()
+<https://firebase.google.com/support/>
 
 License
 -------