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Fix documentation error in commit8703059.

Etsuro Fujita spotted a thinko in the README commentary.

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Original file line number	Diff line number	Diff line change
`@@ -254,7 +254,7 @@ lower leftjoin has min LHS of {B} and min RHS of {C,D}. Given such`
`254`	`254`	`information, join_is_legal would think it's okay to associate the upper`
`255`	`255`	`join into the lower join's RHS, transforming the query to`
`256`	`256`	`B leftjoin (A leftjoin (C innerjoin D) on Pa) on (Pbcd)`
`257`		`-which yields totally wrong answers. We prevent that by forcing the minLHS`
	`257`	`+which yields totally wrong answers. We prevent that by forcing the minRHS`
`258`	`258`	`for the upper join to include B. This is perhaps overly restrictive, but`
`259`	`259`	`such cases don't arise often so it's not clear that it's worth developing a`
`260`	`260`	`more complicated system.`

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