Add documentation link to Cargo.toml

[LingMan]

Crates.io generates its link to the documentation from this value.

[taiki-e]

FYI, the current crates.io can automatically link to docs.rs.

https://doc.rust-lang.org/cargo/reference/manifest.html#the-documentation-field

If no URL is specified in the manifest file, crates.io will automatically link your crate to the corresponding docs.rs page.

[LingMan]

Oh, I wasn't aware of that. Weirdly the link doesn't show up when I open the page:

[cuviper]

Do you have javascript disabled? I see a slight delay before the doc link pops in, so I suppose it's not part of the static content.

[LingMan]

No, but a good pointer. uMatrix blocked the load from docs.rs. Crates that specify the link in their Cargo.toml show up just fine though.

[cuviper]

Ok -- I took a closer look at how rayon loads, as it has a similar documentation link. The page shows the manifest's unversioned link at first, and then it changes to specific doc version. That seems like a good experience to me!

bors r+

[bors[bot]]

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