[racket] Fwd: typo in signatures?

In section 3.2.2 of the online Racket documentation a number of the
signatures of the functions end with "+", e.g.,:

(max x ...+) → real?

Most signatures do not have the +, including those that take an
arbitrary number of arguments, e.g.,:

(+ z ...) → number?

Do the plus signs mean anything, or are they just typos?

(The reason I was looking is to see if there is a version of equal?
that takes a tolerance, like check-=? from rackunit.  What is the
preferred way to check equality for inexact numbers?)

Thanks!
John