Update nix/docs/update-extension.md

Co-authored-by: Bobbie Soedirgo <[email protected]>

Author: samrose

nix/docs/update-extension.md

@@ -5,7 +5,7 @@
 1. Create a branch off of `develop`
 2. For instance, if we were updating https://github.com/supabase/postgres/blob/develop/nix/ext/supautils.nix we would:
    1. change the `version = "2.2.1";` to whatever our git tag release version is that we want to update to
-   2. temporarily empty the `hash = "sha256-wSUEG0at00TPAoHv6+NMzuUE8mfW6fnHH0MNxvBdUiE=";` to `hash = "";` and save  https://github.com/supabase/postgres/blob/develop/nix/ext/supautils.nix and `git add  https://github.com/supabase/postgres/blob/develop/nix/ext/supautils.nix`
+   2. temporarily empty the `hash = "sha256-wSUEG0at00TPAoHv6+NMzuUE8mfW6fnHH0MNxvBdUiE=";` to `hash = "";` and save `supautils.nix` and `git add  .`
    3. run `nix build .#psql_15/exts/supautils` or the name of the extension to update, nix will print the calculated sha256 value that you can add back the the `hash` variable, save the file again, and re-run nix build .#psql_15/exts/supautils. 
    4. Add any needed migrations into the `supabase/postgres` migrations directory
    5. You can then run tests locally to verify that the update of the package succeeded.