Formatting Issue in docs

[sinistersnare]

Just a quick thing I saw, on the fmt page in the docs here i was looking around, and saw an incorrectly formatted title that looks like this (verbatim): <CODE>WRITE!</CODE>

There is a few more errors like these duplicated under the given example also.

I'm not in a position to clone the repo and fix it, so I just wanted y'all to know. Thanks!

[adrientetar]

cc @alexcrichton

[sinistersnare]

Thanks! :)