Rollup merge of #73943 - poliorcetics:unsafe-keyword, r=steveklabnik

Document the unsafe keyword

Partial fix of #34601 (just one more and it will be done 😄).

I tried to be concise and redirect as much as possible on other, longer resources, exposing only the strict necessary.

I also used `SAFETY:` comments to promote good documentation.

I would like a thorough review to ensure I did not introduce mistakes that would confuse people or worse, lead them to write unsound code.

@rustbot modify labels: T-doc,C-enhancement

Edit: this is now the last PR for the original issue: fixes #34601.

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