Update section about oauth2 signing keys #2090
Description
Is your feature request related to a problem? Please describe.
The documentation explains that there are currently two ways to configure dynamic signing keys but there are actually three, being the missing one the most commonly used.
Describe the solution you'd like
The missing third option configures auth_oauth2.issuer and let RabbitMQ discovers the jwks_uri endpoint and then download the signing keys.
Describe alternatives you've considered
No response
Additional context
No response