docs(configuration) note about mem_cache_size usage (#1718)
docs(configuration) note about mem_cache_size usage (#1718)

Co-Authored-By: Aron Eidelman <ce30127eefa07a02d568832e3de6952fb491981c@konghq.com>

Mashape/getkong.org,Mashape/getkong.org,Mashape/getkong.org