MB-6254 Add doxygen style comments to CouchKVStore class
MB-6254 Add doxygen style comments to CouchKVStore class

Change-Id: I2788a3721bbea5f600b89cdc768ee5b8b80b8389
Reviewed-on: http://review.couchbase.org/19756
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

daverigby/kv_engine,daverigby/kv_engine,abhinavdangeti/ep-engine,membase/ep-engine,membase/ep-engine,owendCB/ep-engine,jimwwalker/ep-engine,daverigby/kv_engine,hisundar/ep-engine,jimwwalker/ep-engine,sriganes/ep-engine,abhinavdangeti/ep-engine,owendCB/ep-engine,sriganes/ep-engine,membase/ep-engine,couchbase/ep-engine,sriganes/ep-engine,abhinavdangeti/ep-engine,hisundar/ep-engine,daverigby/ep-engine,abhinavdangeti/ep-engine,owendCB/ep-engine,teligent-ru/ep-engine,teligent-ru/ep-engine,daverigby/ep-engine,couchbase/ep-engine,teligent-ru/ep-engine,teligent-ru/ep-engine,membase/ep-engine,couchbase/ep-engine,sriganes/ep-engine,daverigby/kv_engine,daverigby/ep-engine,owendCB/ep-engine,abhinavdangeti/ep-engine,hisundar/ep-engine,couchbase/ep-engine,hisundar/ep-engine,jimwwalker/ep-engine,daverigby/ep-engine,jimwwalker/ep-engine