MB-37798: Fix comment typo nit
MB-37798: Fix comment typo nit

Change-Id: I98b03644c8febd491a9cc936fe8ffec18e42d54c
Reviewed-on: http://review.couchbase.org/123598
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine