A description outlining any documentation changes required - please provide as much detail as possible, as this will help us to process your docs request faster. Rough drafts or outlines are appreciated!

Here is the draft doc https://docs.google.com/document/d/1x3n6EQlmrmW9cpYH7pnKQwq8jHvGKeah8lGRLoiuipU/edit#

Links to any existing documentation or if possible the documentation requiring changes (for changes to existing content). If your request requires a new section of content, docs site, etc, please ensure that this is stated clearly on the issue. If you are unsure of your documentation requirements, please reach out to a member of the docs team to confirm.

The doc shoud be added to Configuring routes for Knative services as it is a tip to customize OpenShift Route.