remove duplicate option

Author: bshaffer

Spanner/src/SpannerClient.php

@@ -140,8 +140,6 @@ class SpannerClient
      *     @type string $projectId The Google Cloud project ID.
      *     @type string $apiEndpoint A hostname with optional port to use in
      *           place of the service's default endpoint.
-     *     @type string $projectId The project ID from the Google Developer's
-     *           Console.
      *     @type CacheItemPoolInterface $credentialsConfig.authCache A cache for storing access
      *           tokens. **Defaults to** a simple in memory implementation.
      *     @type array $credentialsConfig.authCacheOptions Cache configuration options.