docs: updating contribution docs (#710)

* docs: updating contribution docs

* docs: updated docs

CONTRIBUTING.md

@@ -30,12 +30,19 @@ If you find a bug in the source code or a mistake in the documentation, you can
 help us by submitting [an issue][issue-link]. If the file in which the error
 exists has this header:
 ```
-"""
-This code was generated by
-\ / _    _  _|   _  _
- | (_)\/(_)(_|\/| |(/_  v1.0.0
-      /       /
-"""
+/*
+ * This code was generated by
+ * ___ _ _ _ _ _    _ ____    ____ ____ _    ____ ____ _  _ ____ ____ ____ ___ __   __
+ *  |  | | | | |    | |  | __ |  | |__| | __ | __ |___ |\ | |___ |__/ |__|  | |  | |__/
+ *  |  |_|_| | |___ | |__|    |__| |  | |    |__] |___ | \| |___ |  \ |  |  | |__| |  \
+ *
+ * Twilio - XXXX
+ * This is the public Twilio REST API.
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator.
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
 ```
 then it is a generated file and the change will need to be made by us, but
 submitting an issue will help us track it and keep you up-to-date. If the file