feat: adds style enumeration (#49)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/15862244-2697-4da9-a237-b292c9805d53/targets

- [ ] To automatically regenerate this PR, check this box.

PiperOrigin-RevId: 348668666
Source-Link: googleapis/googleapis@36536e2
PiperOrigin-RevId: 348646270
Source-Link: googleapis/googleapis@34c8140

.jsdoc.js

@@ -1,4 +1,4 @@
-// Copyright 2020 Google LLC
+// Copyright 2021 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -40,7 +40,7 @@ module.exports = {
     includePattern: '\\.js$'
   },
   templates: {
-    copyright: 'Copyright 2020 Google LLC',
+    copyright: 'Copyright 2021 Google LLC',
     includeDate: false,
     sourceFiles: false,
     systemName: '@google-cloud/dialogflow-cx',