`cabal clean --help` still thinks that `dist` is the default `--builddir`

[andreasabel]

$ cabal-3.14.1.1 clean --help                                                                   
Clean the package store and remove temporary files.

Usage: cabal-3.14.1.1 new-clean [FLAGS]

Removes all temporary files created during the building process (.hi, .o,
preprocessed sources, etc.) and also empties out the local caches (by
default).


Flags for clean:
...
 --builddir=DIR                 The directory where Cabal puts generated build
                                files (default dist)

• That should be dist-newstyle rather than dist, I suppose.
• new-clean should be just clean (correct would also be v2-clean but the v2 prefix is generally not printed).

I also think it would be good that the help text "Removes all temporary files..." would add the clarification "in DIR (see --builddir below)".

[ulysses4ever]

Likely a dup of #7924