Subscribe to the article or section
From the Support Web Page, you can click the "Knowledge Base", and choose the category (list left) you need. In "category", it include different "sections", and in "sections", there are "articles" below it.
When you choose the article, click the "Follow"
After that, whenever the article is updated, you will receive an e-mail notification.
When you enter the section page, click the "Follow",
And there are two options that you can choose:
1. Notify when new articles are added.
2. Notify when new articles and comments.
After that, whenever the new article/comments are updated, you will receive an e-mail notification.