The specifics of the change are to replace Chocolatey with ghcup as the preferred installation method of GHC, cabal-install and haskell-language-server on Windows. The overall effect is that the install instructions become common over Windows, Linux and MacOS. The Chocolatey install method is mentioned further down the page. (The PR does not impinge on Stack. The Stack instructions remain unchanged.)
The committee would welcome input from any interested parties, particularly those who have familiarity with Chocolatey, or ghcup on Windows, or both. You are welcome to comment on the PR itself or this Discourse thread.
Thanks to @bodigrim for the PR.