Change doctype for readme.html to HTML5

[gish]

Since the administration panel and twentytwelve have doctype HTML5, there's no need for the readme.html document in the root to remain with the doctype XHTML.

[nacin]

Agreed.

[gish]

Can I help you out with this one?

[nacin]

Replying to gish:

Can I help you out with this one?

Absolutely. You can create a patch, see ​http://make.wordpress.org/core/handbook/submitting-a-patch/

[gish]

Alright, it's been attached. I assume you can add HTML5-specific elements. That would, however, require a shim for IE8.

[nacin]

We still stick to the XHTML flavor of HTML5. So, we should continue to close self-closing elements. And no, we do not yet rely on HTML5-specific elements, as we don't really have a need for them (and still support down to IE7 in the admin).

[gish]

I added a new patch with self-closing elements.

[rmccue]

Replying to gish:

I added a new patch with self-closing elements.

It looks like you may have replaced the first patch when uploading the new one. In general, we recommend against that so that we can see the history of them.

Otherwise, looks good!

[nacin]

In 23188:

Convert to the HTML5 doctype for readme.html. props gish, fixes #22932.