Update links to Rust implementation

[kpp]

This change is 

[kpp]

@iphydf Hello?

[sudden6]

cc @robinlinden

[iphydf]

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Comments from Reviewable

[iphydf]

Please enable the checkbox "Allow edits from maintainers." on the bottom right.

Also, remove the "/" at the end of "tox/" in links.

[kpp]

Done