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docs(derive): Looks like optional isnt supported

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According to #2587
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Ed Page 2021-12-23 10:29:31 -06:00
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examples/derive_ref/README.md
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@ -138,7 +138,6 @@ And for `Subcommand` variants:
- `skip`: Ignore this variant
- `flatten`: Delegates to the variant for more subcommands (must implement `Subcommand`)
- `subcommand`: Nest subcommands under the current set of subcommands (must implement `Subcommand`)
- When `Option<T>`, the subcommand becomes optional
- `external_subcommand`: `clap::AppSettings::AllowExternalSubcommand`
- Variant must be either `Variant(Vec<String>)` or `Variant(Vec<OsString>)`