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`clap_man` doesn't show the right number of value names
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Rust Version
rustc 1.57.0 (f1edd0429 2021-11-29)
Clap Version
3.0.0-rc.0
Minimal reproducible code
TBD
Steps to reproduce the bug with the above code
TBD
Actual Behaviour
When --help
renders value_names, i think it repeats the last one until we've hit the max number of values
Expected Behaviour
We literally show the value names as returned by the Arg
Additional Context
Split out of #3174
Debug Output
No response