https://thingsboard.io/docs/pe/reference/dart-client/ is Python REST Client, not Dart API Client

[liangzhu2008]

This is a...

• Feature Request
• Bug Report

Problem:
https://thingsboard.io/docs/pe/reference/dart-client/ is Python REST Client, not Dart API Client.

Proposed Solution:
Modify thingsboard.github.io/docs/pe/reference/dart-client.md from
{% include docs/pe/reference/python-rest-client.md %}
to
{% include docs/pe/reference/dart-client.md %}

Page to Update:
https://thingsboard.io/docs/pe/reference/dart-client/

the online website version.