HR, App. D.5, minor correction

[Ralf Hinze]

Hi Simon,

here is a minor correction to the May version of the HR.
In appendix D.5 there is a table with an example for
derived instances: for reasons of consistency the line

        showsPrec d (Leaf m) = showParen (d >= 10) showStr

should be replaced by

        showsPrec d (Leaf m) = showParen (d > app_prec) showStr

Cheers, Ralf

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