A minor modification of the Deployment Guide
A minor modification of the Deployment Guide

In the section of General Service Tuning, there is a sentence
"Our Storage servers all run together on the same servers".
The word "servers" is used twice with different meanings, which
would be a little confusing. This patch makes it more understandable.

Change-Id: I6d806456aeb7d0ecf297c04dacbd271b94a0425c
Closes-Bug: #1526697

openstack/swift,redbo/swift,larsbutler/swift,matthewoliver/swift,psachin/swift,rackerlabs/swift,clayg/swift,matthewoliver/swift,prashanthpai/swift,redbo/swift,matthewoliver/swift,williamthegrey/swift,nadeemsyed/swift,swiftstack/swift,hurricanerix/swift,nadeemsyed/swift,hurricanerix/swift,prashanthpai/swift,notmyname/swift,revoer/keystone-8.0.0,openstack/swift,psachin/swift,williamthegrey/swift,clayg/swift,clayg/swift,smerritt/swift,hurricanerix/swift,notmyname/swift,tipabu/swift,aerwin3/swift,tipabu/swift,smerritt/swift,tipabu/swift,smerritt/swift,clayg/swift,psachin/swift,aerwin3/swift,matthewoliver/swift,swiftstack/swift,tipabu/swift,nadeemsyed/swift,openstack/swift,nadeemsyed/swift,revoer/keystone-8.0.0,notmyname/swift,rackerlabs/swift,psachin/swift,notmyname/swift,swiftstack/swift,hurricanerix/swift,larsbutler/swift,openstack/swift,smerritt/swift