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
• 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

[scholzj]

LGTM. Thanks.

[PaulRMellor]

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

[katheris]

Thanks @PaulRMellor, LGTM