Add documentation in quay plugin to explain new credential settings in proxy backend (backstage 1.28) #1901
Description
What do you want to improve?
Add documentation around new [Optional] credential settings in backstage 1.28 to explain different settings available to the users.
See Backstage 1.28 release notes about the BREAKING: Proxy backend plugin protected by default
What does the current documentation state?
Current documentation does not have this section.
What would you like to be added/updated in the documentation?
Add a note about this new credentials settings in quay plugin.