wrap_comments doesn't reflow text.

[alercah]

Another one for wrap_comments:

/// this
/// is
/// an
/// unnecessarily
/// tall
/// comment.
fn foo() {}

The formatter doesn't format these comments

While this may be desirable in some cases, (e.g. TODOs), in light of #627, perhaps a better general solution is to add a markdown formatter and use it inside doc comments, since those are necessarily Markdown, ideally independently of whether or not non-doc comments are formatted.

[ytmimi]

Confirming I can reproduce this using rustfmt 1.5.1-nightly (0f93f53e 2022-07-19)

Not sure if this is actually an issue with wrap_comments, but going to link the wrap_comments tracking issue #3347 just in case.