Update doumentatation for import of custom rule nodes to ThingsBoard instance with instructions for Windows and other distributions.

[ShvaykaD]

This is a...

• Feature Request
• Bug Report

Problem:

Original ticket: thingsboard/rule-node-examples#23

Proposed Solution:

update Step 4. Import custom rule nodes to your ThingsBoard instance with instructions for Windows and other distributions.

Page to Update:

https://thingsboard.io/docs/user-guide/contribution/rule-node-development/