Update README (#1132)
Update README (#1132)

Fix broken links per: https://github.com/GoogleCloudPlatform/java-docs-samples/issues/1118
GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples