docs(samples): hardcode parameter in webhook sample (#268)

* streamline and clarify webhook samples

Change-Id: I80d80b42f60ac6ccc643afb7b2931916d6843813

* remove sessionInfo config

Change-Id: I1b14852ad9e238e7cdc04dbb418ed5ed0fca2992

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* hardcode parameter

Change-Id: Iea962f2ea2bf73ca86ce3ecd7852a290dd3a2fac

* clarify parameter name

Change-Id: I5c0a1c654be5133889f4838a118e5bdebe667303

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

dialogflow-cx/configure-webhook-to-set-form-parameter-as-optional-or-required.js

@@ -21,14 +21,13 @@
 exports.configureOptionalFormParam = (request, response) => {
   // The value of the parameter that the webhook will set as optional or required.
   // Note that the webhook cannot add or remove any form parameter
-  const parameter = request.body.pageInfo.formInfo.parameterInfo[0].value;
 
   const jsonResponse = {
     pageInfo: {
       formInfo: {
         parameterInfo: [
           {
-            displayName: parameter,
+            displayName: 'order-number',
             // if required: false, the agent will not reprompt for this parameter, even if the state is 'INVALID'
             required: true,
             state: 'VALID',