Is your feature request related to a problem? Please describe.
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In pursuit of improving the doc comment experience, auto-formatting them would be sweet.

Describe the solution you'd like
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We should be able to pull a solution off the shelf (I do not want to go down the rabbit hole of homebrewing a markdown formatting crate inside wdl-format). Possible lead here - https://github.com/rvben/rumdl

Describe alternatives you've considered
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I started noodling at this in #614 and the logic started spiraling out of control, leading to reverting this feature - 98bd73b