Typo (5.3.3.1)

[kosgdk]

5.3.3.1 Multiple Parameter Lists

if Scala infers B for end it cannot then use this inferred type for the B inpair, so we must often write a type declaration on pair. However, Scala can use types inferred for one parameter list in another parameter list. Soif we write fold as

Missing space: inpair should be in pair