fix key spelling errors, type errors, things-should-not-be-comments errors Change-Id: I3ce12873aa78002bca686bd88404771895b05d30
Overhaul `nix flake update` and `nix flake lock` UX (cherry picked from commit 12a0ae73dbb37becefa5a442eb4532ff0de9ce65) Change-Id: Iff3b4f4235ebb1948ec612036b39ab29e4ca22b2