sha2 sha3 dead links in docs
on https://nim-lang.org/docs/sha1.html
the 2 links are dead :
`sha2 module` -> https://nim-lang.org/docs/sha2.html
`sha3 module` -> https://nim-lang.org/docs/sha3.html

this was already reported last year in https://github.com/nim-lang/Nim/issues/23076
and closed as completed , but the mentioned committed fix didn't solve it .
the 2 links are still dead .
