When trying to determine whether content is product documentation or knowledge base:

Product documentation and knowledge bases live in different places, are largely maintained by different teams, and contain a lot of the same information. Content placement depends on the type and purpose of content.

At UCLA:

Product documentation:

Knowledge Base articles:

 

Each team responsible for developing and/or operating a system is responsible for its product documentation:

 

For more information go to:
Product Documentation vs. Knowledge Base