Merge pull request #6929 from phadej/verbosity-stderr

...l/Cabal-QuickCheck/src/Test/QuickCheck/Instances/Cabal.hs

Cabal/Cabal-described/src/Distribution/Described.hs

Cabal/Distribution/Simple/Utils.hs

Cabal/Distribution/Verbosity.hs

Cabal/Distribution/Verbosity/Internal.hs

Cabal/doc/buildinfo-fields-reference.rst

Cabal/tests/UnitTests/Distribution/Described.hs

Cabal/tests/UnitTests/Distribution/Utils/Structured.hs

...o-reference-generator/buildinfo-reference-generator.cabal

buildinfo-reference-generator/template.zinza

cabal.project.buildinfo