haskell-modules/HACKING: drop note about deleting haskell-updates

This shouldn't be possible anymore thanks to branch protection.

Changed files
-4
pkgs
development
haskell-modules
-4
pkgs/development/haskell-modules/HACKING.md
···
If `maintained` packages are failing on Darwin, it is helpful to
mark them as broken on that platform.
-
When you've double-checked these points, go ahead and merge the `haskell-updates` PR.
-
After merging, **make sure not to delete the `haskell-updates` branch**, since it
-
causes all currently open Haskell-related pull-requests to be automatically closed on GitHub.
-
## Script for Merging `haskell-updates` and Opening a New PR
There is a script that automates merging the current `haskell-updates` PR and