Docs: update link to Objective-C runtime

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Matthew Butterick 2020-05-19 08:28:06 -07:00 committed by GitHub
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@ -24,7 +24,7 @@
The library supports Objective-C interaction in two layers. The upper
layer provides syntactic forms for sending messages and deriving
subclasses. The lower layer is a thin wrapper on the
@link["http://developer.apple.com/DOCUMENTATION/Cocoa/Reference/ObjCRuntimeRef/index.html"]{Objective-C
@link["https://developer.apple.com/documentation/objectivec"]{Objective-C
runtime library} functions. Even the upper layer is unsafe and
relatively low-level compared to normal Racket libraries, because
argument and result types must be declared in terms of FFI C types