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Document use of --allow-newer

Merged Document use of --allow-newer
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@@ -69,6 +69,8 @@ active-repositories: hackage.haskell.org, head.hackage.ghc.haskell.org
Also see
https://cabal.readthedocs.io/en/latest/cabal-project.html#cfg-field-active-repositories.
`HEAD.hackage` doesn't bump the bounds of boot packages + certain other packages to avoid the busywork of bumping them. When using `HEAD.hackage`, you should use `--allow-newer` for these packages. The full list is [here](https://gitlab.haskell.org/ghc/head.hackage/-/blob/90570e1c4606c1d7d3d41797ec1b32d1b984067b/ci/MakeConstraints.hs#L40-49).
### As an add-on remote repository
It is *not* recommended to add the `HEAD.hackage` repository index to