chore: update client_documentation link (#166)

Author: dwsupplee

.repo-metadata.json

@@ -2,7 +2,7 @@
   "name": "spanner-jdbc",
   "name_pretty": "Google Cloud Spanner JDBC",
   "product_documentation": "https://cloud.google.com/pubsub/docs/",
-  "client_documentation": "https://googleapis.dev/java/google-cloud-clients/latest/index.html?com/google/cloud/spanner/jdbc/v1",
+  "client_documentation": "https://googleapis.dev/java/google-cloud-spanner-jdbc/latest/index.html",
   "release_level": "ga",
   "language": "java",
   "repo": "googleapis/java-spanner-jdbc",