fix(auth): Fix doc string and use correct error message

Author: jonathanedey

src/main/java/com/google/firebase/auth/ActionCodeSettings.java

@@ -149,7 +149,7 @@ public Builder setDynamicLinkDomain(String dynamicLinkDomain) {
 
     /**
      * Sets the link domain to use for the current link if it is to be opened using
-     * HandleCodeInApp, as multiple link domains can be configured per project. This
+     * {@code handleCodeInApp}, as multiple link domains can be configured per project. This
      * setting provides the ability to explicitly choose one. If none is provided, the default
      * Firebase Hosting domain will be used.
      *

src/main/java/com/google/firebase/auth/internal/AuthErrorHandler.java

@@ -77,8 +77,8 @@ final class AuthErrorHandler extends AbstractHttpErrorHandler<FirebaseAuthExcept
               "INVALID_HOSTING_LINK_DOMAIN",
               new AuthError(
                   ErrorCode.INVALID_ARGUMENT,
-                  "The provided hosting link domain is not "
-                      + "configured or authorized for the current project",
+                  "The provided hosting link domain is not configured in Firebase Hosting or is "
+                      + "not owned by the current project",
                   AuthErrorCode.INVALID_HOSTING_LINK_DOMAIN))
           .put(
               "PHONE_NUMBER_EXISTS",