fix(OptionParser): correct error message when flag has underscores #13925
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Given this scenario:
`OptionParser.parse!(["--foo_bar", "baz"], strict: [foo_bar: :string])`
the current error message is:
```
** (OptionParser.ParseError) 1 error found!
--foo_bar : Missing argument of type string
(elixir 1.17.2) lib/option_parser.ex:301: OptionParser.parse!/2
iex:5: (file)
```
This PR fixes it to instead be
```
** (OptionParser.ParseError) 1 error found!
--foo_bar : Unknown option. Did you mean --foo-bar?
(elixir 1.17.2) lib/option_parser.ex:301: OptionParser.parse!/2
iex:5: (file)
```
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Given this scenario:
OptionParser.parse!(["--foo_bar", "baz"], strict: [foo_bar: :string])the current error message is:
This PR fixes it to instead be