relnotes: Rustdoc is a header

[lolbinarycat]

also bump source permalink

Rendered

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[apiraino]

@lolbinarycat why add Rustdoc only? I count now 12 items in the changelog header, would it make sense mentioning them all?

(if I understand correctly the connection between that code and this page of the forge)

[lolbinarycat]

Rustdoc was the only one i noticed was missing.

also, i only count 10, not 12?

[apiraino]

Yes, 10 (sorry)

[apiraino]

Thanks! Feel free to rebase and squash the commits.

[lolbinarycat]

@apiraino squashed and rebased.