Misleading documentation about profiling

[brprice]

[Related issues: #793 , #887]

Searching the docs for profiling only brings up one relevant section: Troubleshooting:Nix-only configuration options, where setting profiling: true in cabal.project is mentioned as better than doing the setting via nix, to "ensure that the two builds agree".
(The relevant source is https://github.com/input-output-hk/haskell.nix/blame/master/docs/troubleshooting.md#L69)

Unfortunately, due to #887, this is known not to work! (And is rather confusing if one is trying to work out how to turn profiling on.)

Is there some other common option to use as an example which haskell.nix does, in fact, read from cabal.project that we could use as an example instead?

[georgefst]

Based on #839 (comment), I'd guess that this does work with the v1-* cabal commands, hence the example being chosen originally.

Of course, the v2-* commands have been the default for about two years now, so this is not ideal.

[michaelpj]

Yes, this is an unfortunate example. tests:true might be a better one.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[georgefst]

Still an issue.

[dhess]

Bump.