User story: 

Add a section about the required permissions that Serverless Operator needs to work so an user can understand the implications of installing Serverless Operator on the cluster.

OCP/OSD/ROSA: OCP

OCP version(s): The code changes were introduced in 1.28, but the documentation changes are not version specific

Feature GA/TP: Existing Documentation

Upstream/draft documentation:

• Existing documentation
• Draft documentation/proposed changes: https://docs.google.com/document/d/1EvCH8fr2tWFBhnbnEcVsq1YuhOii80pPRn-Jza9ydBU/edit#