Rollup merge of #120937 - ian-h-chamberlain:docs/update-3ds-links-and-info, r=JohnTitor

[docs] Update armv6k-nintendo-3ds platform docs for outdated info

Mostly just fixing links and references to renamed crates, but also updating a bit of outdated info as well.

CC `@Meziu` `@AzureMarker`

Author: matthiaskrgr