Very long monospace words cause rustdoc to look strange

[WaffleLapkin]

I tried this code:

/// `vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv`
pub struct Item;

I expected to see some kind of wrapping in rendered docs, but instead, this adds a horizontal ruler. The ruler allows moving docs
below left panel:

GIF that shows the problem

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rustdoc 1.48.0-nightly (1fd5b9d51 2020-09-20)

cc @GuillaumeGomez

[GuillaumeGomez]

Thanks for opening the issue! I'll fix it tomorrow.