[Haskell-cafe] Why is the Cabal User's Guide left outdated?

Getting interested in the features since Cabal 2.2 (esp. common stanzas), I looked up with the User's Guide https://www.haskell.org/cabal/users-guide/, which is (and should be) listed in the search result first, but can't find because the User's Guide is still about Cabal 2.0. Why is it left outdated? Actually User's Guide (HEAD) https://cabal.readthedocs.io/en/latest/ is kept updated, but it's hard to find, and can include some information too new to release. Thanks in advance. -- 山本悠滋 twitter: @igrep GitHub: https://github.com/igrep GitLab: https://gitlab.com/igrep Facebook: http://www.facebook.com/igrep Google+: https://plus.google.com/u/0/+YujiYamamoto_igrep