Fix 404s and remove missing SwiftSample references (#9517)

Fixes #9505.

Author: morganchen12

FirebaseAuth/Tests/Sample/README.md

@@ -10,16 +10,16 @@ You'll need valid `GoogleService-Info.plist` files for those samples. To get you
 2. Create a new Firebase project, if you don't already have one
 3. For each sample app you want to test, create a new Firebase app with the sample app's bundle
 identifier (e.g. `com.google.FirebaseExperimental1.dev`)
-4. Download the resulting `GoogleService-Info.plist` and place it in
-[Sample/GoogleService-Info.plist](Sample/GoogleService-Info.plist)
+4. Download the resulting `GoogleService-Info.plist` and place it in the
+[`Sample/` directory](Sample/)
 
 #### GoogleService-Info\_multi.plist files
 
 1. Create a second sample app and download its `GoogleService_Info.plist` file.  This can be in the
 same Firebase project as the one above, or a different one.  Use a different app bundle identifier
 (e.g.  `com.google.FirebaseExperimental2.dev`).
 2. Save this plist file as `GoogleService-Info_multi.plist` in
-[Sample/GoogleService-Info\_multi.plist](Sample/GoogleService-Info_multi.plist).
+the [`Sample/` directory](Sample/).
 This enables testing that FirebaseAuth continues to work after switching the Firebase App in the
 runtime.
 
@@ -59,34 +59,6 @@ relevant appLinks domain. Your appLinks domains are domains that your app will h
 links, in this particular case you can obtain this domain from the aforementioned Dynamic Links
 section of the Firebase Console.
 
-
-### Running SwiftSample Application
-
-In order to run this application, you'll need to follow the following steps!
-
-#### GoogleService-Info.plist files
-
-You'll need valid `GoogleService-Info.plist` files for those samples. To get your own
-`GoogleService-Info.plist` files:
-1. Go to the [Firebase Console](https://console.firebase.google.com/)
-2. Create a new Firebase project, if you don't already have one
-3. For each sample app you want to test, create a new Firebase app with the sample app's bundle
-identifier (e.g. `com.google.FirebaseExperimental2.dev`)
-4. Download the resulting `GoogleService-Info.plist` and place it in
-[SwiftSample/GoogleService-Info.plist](SwiftSample/GoogleService-Info.plist)
-
-#### Info.plist file
-
-Please follow the instructions in
-[SwiftSample/InfoTemplate.plist](SwiftSample/InfoTemplate.plist)
-to generate the right Info.plist file
-
-#### Getting your own Credential files
-
-Please follow the instructions in
-[SwiftSample/AuthCredentialsTemplate.swift](SwiftSample/AuthCredentialsTemplate.swift)
-to generate the AuthCredentials.swift file.
-
 ### Running API tests
 
 In order to run the API tests, you'll need to follow the following steps!