[Issue 18972] __traits(getOverloads) example with 3rd argument doesn't compile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18972

--- Comment #2 from Basile B. <b2.temp at gmx.com> ---
However it's true that the DDOC has been merged too eagerly, leading to
confusion.

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