Add @deprecated tag in the Javadoc as well.

Author: rosalyntan

appcheck/firebase-appcheck-safetynet/src/main/java/com/google/firebase/appcheck/safetynet/SafetyNetAppCheckProviderFactory.java

@@ -23,6 +23,8 @@
 /**
  * Implementation of an {@link AppCheckProviderFactory} that builds {@link
  * SafetyNetAppCheckProvider}s. This is the default implementation.
+ *
+ * @deprecated Use {@code PlayIntegrityAppCheckProviderFactory} instead.
  */
 @Deprecated
 public class SafetyNetAppCheckProviderFactory implements AppCheckProviderFactory {
@@ -35,6 +37,8 @@ private SafetyNetAppCheckProviderFactory() {}
   /**
    * Gets an instance of this class for installation into a {@link
    * com.google.firebase.appcheck.FirebaseAppCheck} instance.
+   *
+   * @deprecated Use {@code PlayIntegrityAppCheckProviderFactory#getInstance} instead.
    */
   @Deprecated
   @NonNull