Rollup merge of #148504 - NeatNit:intlong, r=ibraheemdev

Fix link in c_longlong documentation

Ran across this mistake when reading [the documentation](https://doc.rust-lang.org/std/ffi/type.c_longlong.html). I went through the other `.md` files in this directory and didn't spot any other errors.

**I did not check the output of this change** - I couldn't figure out how to get `cargo doc` to work and I figured it's not worth the distraction. It can't really go wrong, can it?

Author: matthiaskrgr