Typo in args README and code snippet

[DartBot]

This issue was originally filed by @sethladd

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http://pub.dartlang.org/packages/args

parser.addOption('out', help: 'The output path', helpValue: 'path',

(notice the helpValue)

However, according to the docs:

void addOption(String name, {String abbr, String help, String valueHelp, List<String> allowed, Map<String, String> allowedHelp, String defaultsTo, Function void callback(value), bool allowMultiple: false, bool hide: false})

(notice valueHelp)

[DartBot]

This comment was originally written by @sethladd

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Can't wait to get these packages onto Github... fixing this would be so easy! :)

[sethladd]

Added Area-Pkg, Pkg-Args, Triaged labels.

[sethladd]

Hi Bob,

I was just bit by this again. (will I ever learn?!?)

Is this something we can fix relatively soon?

Not sure what is correct:

helpValue or valueHelp ?

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cc @munificent.

[srawlins]

Set owner to @srawlins.
Added Started label.

[srawlins]

Added Fixed label.

[DartBot]

This issue has been moved to dart-lang/args#34.