chore: update repo-metadata.json client_documentation link (#697)

* chore: updating doc link

* chore: fix missing comma

Author: eaball35

.repo-metadata.json

@@ -2,7 +2,7 @@
     "name": "monitoring",
     "name_pretty": "Stackdriver Monitoring",
     "product_documentation": "https://cloud.google.com/monitoring/docs",
-    "client_documentation": "https://googleapis.dev/java/google-cloud-monitoring/latest/",
+    "client_documentation": "https://cloud.google.com/java/docs/reference/google-cloud-monitoring/latest/history",
     "issue_tracker": "https://issuetracker.google.com/savedsearches/559785",
     "release_level": "ga",
     "language": "java",