manual: Fix addCheck
example having arguments in wrong order.
`addCheck` takes first the type, then the check.
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@ -282,7 +282,7 @@ config.mod.two = { foo = 2; bar = "two"; };</screen></example>
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<screen>
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byte = mkOption {
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description = "An integer between 0 and 255.";
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type = addCheck (x: x >= 0 && x <= 255) types.int;
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type = addCheck types.int (x: x >= 0 && x <= 255);
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};</screen></example>
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<example xml:id='ex-extending-type-check-2'><title>Overriding a type
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