9cb55966fe
4333: Update Arch Linux and ALE install instructions r=matklad a=polyzen
Package has been added to the Arch repos:
https://www.archlinux.org/packages/community/x86_64/rust-analyzer/
ALE merged rust-analyzer support:
70005134e5
Co-authored-by: Daniel M. Capella <polyzen@archlinux.org>