Add the item type to the tooltip

[notriddle]

See:
https://users.rust-lang.org/t/seeking-opinions-from-colorblind-rustaceans-coloring-in-rustdoc-code-blocks

[rust-highfive]

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[QuietMisdreavus]

Nice! Would it be possible to render the docs with this and get a couple screenshots with the new tooltips?

[notriddle]

[notriddle]

And, one last thing, the Result types:

[QuietMisdreavus]

Thanks! That one with Iterator::Item is a little weird. It's pulling from the same type info that its link is getting, so in that sense it's correct, but something seems off if everything else has the same name as its text but that. I'd like for that to have something like type std::iter::Iterator::Item but I'm not sure how you'd get there offhand. (That might also cause associated items to render in orange, since that's the color for "type"s.)

[GuillaumeGomez]

Thanks a lot for this. Since everyone seems to agree on the improvement here, let's merge!

@bors: r+ rollup

[bors]

📌 Commit bc4ad1a has been approved by GuillaumeGomez