kafka: consolidate the mixed usage the kafka and kafka-c#217

HofiOne merged 1 commit intosyslog-ng:mastersyslog-ng/syslog-ng.github.io:masterfrom

HofiOne:Consolidate-the-`kafka`-destination-option-remove-confusingly-used-`kafka`-and-`kafka-c`-mentions-216HofiOne/syslog-ng.github.io:Consolidate-the-`kafka`-destination-option-remove-confusingly-used-`kafka`-and-`kafka-c`-mentions-216Copy head branch name to clipboard