Minor fix for phrasing on the pillowfight note.

Change-Id: I6a6bc65d43e4f919a4eaa62fe2e267d36a278dcf
Reviewed-on: http://review.couchbase.org/25519
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Matt Ingenthron <matt@couchbase.com>