Simplify DocumentationComment.documentationFrom #4141
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Sometimes I find these funny impls in a class hierarchy, like this one, where the top impl says, "OK to calculate documentationFrom, first, am I an Inheritable? Oh do it this way. Otherwise do it another way." Ok... so let's just implement it the one way on the Inheritable mixin, and implement it the other way up top.
This also gets rid of the field, which should not be necessary.
This should be a no-op.