Add note on callback for retries

[welteki]

Signed-off-by: Han Verstraete (OpenFaaS Ltd) [email protected]

Description

Add a note in the retries documentation to inform users about the new behaviour for undelivered messages that reach maximum retries.

Motivation and Context

Documentation update for changes made in:

• https://github.com/openfaasltd/nats-queue-worker/pull/5
• https://github.com/openfaasltd/jetstream-queue-worker/pull/9

How Has This Been Tested?

Verified locally

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [x] I have signed-off my commits with git commit -s