Pierre-Yves David <pierre-yves.david@octobus.net> [Tue, 26 Mar 2024 08:43:20 +0000] rev 51584
perf-stream-locked-section: advertise the right version key in the help
As the v3 format is still experimental, its key is "v3-exp". The help text was
not pointing that out.
(we also fix `perf::stream-generate` in the process)