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Improve comment for GetStableLatestTransactionId().

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Original file line number	Diff line number	Diff line change
`@@ -393,8 +393,10 @@ GetCurrentTransactionIdIfAny(void)`
`393`	`393`	`/*`
`394`	`394`	`*GetStableLatestTransactionId`
`395`	`395`	`*`
`396`		`- * Get the XID once and then return same value for rest of transaction.`
`397`		`- * Acts as a useful reference point for maintenance tasks.`
	`396`	`+ * Get the transaction's XID if it has one, else read the next-to-be-assigned`
	`397`	`+ * XID. Once we have a value, return that same value for the remainder of the`
	`398`	`+ * current transaction. This is meant to provide the reference point for the`
	`399`	`+ * age(xid) function, but might be useful for other maintenance tasks as well.`
`398`	`400`	`*/`
`399`	`401`	`TransactionId`
`400`	`402`	`GetStableLatestTransactionId(void)`

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