Update Intl.DateTimeFormat to show options in constructor

[hamishwillee]

Previous example just shows default formatting based on locale, and locale with language fallback. This extends the example just a little to show how the date can be formatted using style and custom options.

[chrisdavidmills]

Hi @hamishwillee !

This is looking pretty good. I just had a coupleof issues here:

1. Generally we try to keep interactive examples to about 13 lines long at a maximum, otherwise they don't fit very well in the context of the rest of the page. Can you try to cut this down a bit?

2. You've got some CI failures to pick through and fix, mainly just stylistic stuff.

[hamishwillee]

@chrisdavidmills This was already thirteen lines before I started, and showed only a fraction of what this can do :-(. I deleted a few interesting options and got it down to 14. If that is too many we might as well just just close this an accept we can't do a good job.

[chrisdavidmills]

This looks much better! You still have a CI error, but nearly there.

[hamishwillee]

Fixed!

[chrisdavidmills]

Much better, thanks!