swift-argument-parser
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Document `--` to support all remaining command line args as Arguments
Looks like some of the tests already confirm it, but the documentation doesn't seem to call out that the library does support the standard of taking an -- argument to then map all following command line args to be Arguments (and never recognize them as Flags/Options).
We really should cover all the different kinds of syntax that are allowed, such as grouped short options and --option=value style options. May be good to say what isn't currently supported as well, like -j5 style short options.
When I filed this, I was thinking the Markdown docs on the site; but thinking about it again, the generated help might also need to include some more details about things like this too.
