Update docs for webhooks (#551)

* update mdx docs

* add section to autogeneration docs

* Update api-playground/openapi/setup.mdx

Co-authored-by: Hahnbee Lee <[email protected]>

---------

Co-authored-by: Hahnbee Lee <[email protected]>

Author: lawreka

api-playground/openapi/setup.mdx

@@ -96,18 +96,24 @@ only one OpenAPI file - it will automatically detect your OpenAPI file.
 <br />
 
 <Note>
-  The method and path must match the method and path specified in the OpenAPI
-  document exactly. If the endpoint doesn't exist in the OpenAPI file,
-  the page will be empty.
+  In most cases, the method and path must match the method and path specified
+  in the OpenAPI document exactly. If the endpoint doesn't exist in the OpenAPI
+  file, the page will be empty.
+
+  For webhooks, replace the method (i.e. "POST") with "webhook" (case insensitive)
+  and the correct method will be generated.
 </Note>
 
 ### Autogenerate files
 
 For large OpenAPI documents, creating one MDX page for each OpenAPI operation can be a lot of work. To make it easier, we created a local OpenAPI page scraper.
 
 Our Mintlify [scraper](https://www.npmjs.com/package/@mintlify/scraping)
-autogenerates MDX files for your OpenAPI endpoints. Use the relative path to the
-OpenAPI document in your codebase.
+autogenerates MDX files for your OpenAPI endpoints.
+
+Each generated page will correspond to an OpenAPI operation under the "paths" section of the OpenAPI schema.
+If your OpenAPI document is version 3.1+, the scraper will also generate pages for webhooks under the "webhooks" section of the OpenAPI schema.
+
 
 ```bash
 npx @mintlify/scraping@latest openapi-file <path-to-openapi-file>