Document kafka-connect-offset related properties

For now it's unclear, which connectors properties may cause it's total reset and which could be applied or change without interfering into current progress. The issue is created due to the unexpected incident experienced after changing (1.6.1.Final) https://debezium.io/documentation/reference/1.6/connectors/postgresql.html#postgresql-property-database-server-name
If such extreme behavior is by-design it would be more than welcome to have a list of properties, which cannot be changed without significant consequences & which are for simple "tweaking" purposes. Looking forward for such documentation improvement, so no one will end up in the same unpleasant situation/astonishment.