message: repokitteh: tighten API path expression.
  Reduce the number of false positives we see during review. API shepherds
  were being flagged on files in include/envoy/api for example.
diff: @@ -17,13 +17,13 @@ use(
  },
  {
  "owner": "envoyproxy/api-shepherds!",
  - "path": "api/",
  + "path": "api/envoy/",
  "label": "api",
  "github_status_label": "any API change",
  },
  {
  "owner": "envoyproxy/api-watchers",
  - "path": "api/",
  + "path": "api/envoy/",
  },
  ],
  )
  