Fix readme link
Fix readme link

GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,jetty-project/java-docs-samples,jetty-project/java-docs-samples,jetty-project/java-docs-samples,jetty-project/java-docs-samples,jetty-project/java-docs-samples,GoogleCloudPlatform/java-docs-samples