Fix reference in Take docs

[fanatid]

On page https://docs.rs/bytes/0.5.4/bytes/buf/ext/struct.Take.html
take() lead to https://docs.rs/bytes/0.5.4/bytes/buf/ext/trait.Buf.html#method.take

The requested resource does not exist

Should be: https://docs.rs/bytes/0.5.4/bytes/buf/ext/trait.BufExt.html#method.take

[LucioFranco]

Thanks!

[taiki-e]

@fanatid Could you merge tokio-rs/master into this branch to fix CI? (looks like this PR does not allow edits by maintainers)

[fanatid]

@taiki-e CI is fine now.

[taiki-e]

Thanks!