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Show the actual available flags in useline #2105

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Show the actual available flags in useline #2105

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Commits on Feb 1, 2024

  1. Show the actual available flags in useline 

    Use common useline notation for available flags:

- `[-f foo]` for (standard) optional flags
- `[-f foo | -b bar]` for mutually exclusive flags
- `-f foo` for required flags
- `{-f foo | -b bar}` for mutually exclusive flags where one is required
- `[-f foo -b bar]` for flags required as a group

For a boolean flag `f`, ` foo` is dropped from the above. The foo/bar
comes from `flag.UnquoteUsage`.
    @lugray
    lugray committed Feb 1, 2024
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