[SE-0326] Fix an example in the Motivation section
#1465
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`map` shouldn't have `BinaryInteger` requirement on `T`. Original example had `doSomething` return `U: BinaryInteger`, which aligned with `map` that returns `T`. After pitch the example has been adjusted - `doSomething` now returns `Void` which means that `map` with `BinaryInteger` requirement wouldn't type-check.
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mapshouldn't haveBinaryIntegerrequirement onT.Original example had
doSomethingreturnU: BinaryInteger,which aligned with
mapthat returnsT. After pitch theexample has been adjusted -
doSomethingnow returnsVoidwhich means that
mapwithBinaryIntegerrequirementwouldn't type-check.