link to Future::poll from the Poll docs

[oconnor663]

The most important thing about Poll is that Future::poll returns it, but previously the docs didn't emphasize this.

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[oconnor663]

Updated as suggested. Upon closer inspection, it looks like the other part of the same page that's using <code> tags is getting fancy with links within the code block:

[tgross35]

Interesting, rustdoc does support generics like [`Poll<std::string::String>`]. 🤷

Thanks for this fixup!

r? @tgross35 @bors r+ rollup

[bors]

:pushpin: Commit 3153b7d7b4e2d528e13c40559e644bfca0735389 has been approved by tgross35

It is now in the queue for this repository.