docs(connectors): adds procedures to manage connector offsets

[PaulRMellor]

Documentation

Adds procedures to manage Kafka Connect connectors. Plus note on using the same configuration for MM2 connectors. Plus a couple of minor updates and typo fixes

Checklist

Please go through this checklist and make sure all applicable tasks have been done

• [ ] Write tests
• [ ] Make sure all tests pass
• [x] Update documentation
• [ ] Check RBAC rights for Kubernetes / OpenShift roles
• [ ] Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• [ ] Reference relevant issue(s) and close them after merging
• [ ] Update CHANGELOG.md
• [ ] Supply screenshots for visual changes, such as Grafana dashboards

[PaulRMellor]

Thanks for the review @scholzj I've updated the intros to be clear about the stop/starts For verification of resets and alterations, I've included a step to link back to the listing procedure

[PaulRMellor]

Thanks for the review @katheris As advised, I've expanded the MM2 section