doc: add tech link for box in 'immutable?' description

This commit is contained in:
Ben Greenman 2017-06-21 01:46:34 -04:00
parent d90976f865
commit a915433b02

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@ -126,7 +126,7 @@ converted to @racket[#t] before being returned by
@defproc[(immutable? [v any/c]) boolean?]{
Returns @racket[#t] if @racket[v] is an immutable @tech{string},
@tech{byte string}, @tech{vector}, @tech{hash table}, or box,
@tech{byte string}, @tech{vector}, @tech{hash table}, or @tech{box},
@racket[#f] otherwise.
Note that @racket[immutable?] is not a general predicate for