[+0-all-args] Document the swift exposed functions in Reflection.mm as being either methods or free functions.
[+0-all-args] Document the swift exposed functions in Reflection.mm as being either methods or free functions.

Some of the free functions have method like names, so it is impossible to know
whether or not the given functions use the method convention or the thin
convention. At least now it is documented.

rdar://34222540

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