Document GetStateByRangeWithPagination behavior
Document GetStateByRangeWithPagination behavior

Document GetStateByRangeWithPagination behavior including
the difference between leveldb and couchdb that was identified in #3229.

Signed-off-by: David Enyeart <3d699cfec69cc11a9ba1c3a1aef3260ab163489b@us.ibm.com>

manish-sethi/fabric,manish-sethi/fabric,hyperledger/fabric,hyperledger/fabric