Correctly use doc comments in macros

Our custom macros for conveniently creating types with additional meta
information for working with structopt do not actually use the doc
comments we have in place -- these comments are solely for in-source
documentation. We are an application and as such crates.io will not
automatically generate documentation.
All of that does not deter rustc from complaining that doc comments are
unused. In the past we tried to fudge that by adding a special
allowance, #[allow(unused_doc_comments)], but that seems to have seized
to work.
With this change we finally give in and move the doc comment into the
macro itself, where it will be used to annotate the generated type. This
step should hopefully silence rustc once and for all -- at the expense
of a slight decrease in readability.

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