Add mention in release notes about innostore and stack size on 32-bit systems.
Add mention in release notes about innostore and stack size on 32-bit systems.

Fixes: az923

authbox-lib/riak,elkingtonmcb/riak,amyvmiwei/riak,DavidAlphaFox/riak,yangchengjian/riak,planobe/riak,biddyweb/riak,glickbot/riak,GabrielNicolasAvellaneda/riak,laurenrother/riak,planobe/riak,basho/riak,xuejianhai/riak