Fix Firebase Console URL in README (#3047)
Fix Firebase Console URL in README (#3047)

Fix Firebase Console URL in README.
GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples