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Improve description of read/write traffic scalability

Greg Smith, after a suggestion of James Bruce

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Original file line number	Diff line number	Diff line change
`@@ -188,9 +188,10 @@ protocol to make nodes agree on a serializable transactional order.`
`188`	`188`	`<para>`
`189`	`189`	`With statement-based replication middleware, a program intercepts`
`190`	`190`	`every SQL query and sends it to one or all servers. Each server`
`191`		`- operates independently. Read-write queries are sent to all servers,`
`192`		`- while read-only queries can be sent to just one server, allowing`
`193`		`- the read workload to be distributed.`
	`191`	`+ operates independently. Read-write queries must be sent to all servers,`
	`192`	`+ so that every server receives any changes. But read-only queries can be`
	`193`	`+ sent to just one server, allowing the read workload to be distributed`
	`194`	`+ among them.`
`194`	`195`	`</para>`
`195`	`196`
`196`	`197`	`<para>`

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