fix spelling mistake identified by goreportcard
fix spelling mistake identified by goreportcard

Change-Id: I805e393ca218b2d6c8c95a458b62c3cb168ba165
Reviewed-on: http://review.couchbase.org/60712
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Marty Schoch <ba9951d7d66412e2a57aea395f01176a793cf5eb@gmail.com>

steveyen/moss,couchbaselabs/moss,steveyen/moss