[whatwg/dom] Consider more name validation loosening (Issue #1373)

domenic created an issue (whatwg/dom#1373)

### What is the issue with the DOM Standard?

After #1079, the following parts of the spec will still reference XML name stuff:

- `createProcessingInstruction()` checks against the XML `Name` production
- `createDocumentType()` checks against the XML Namespaces `QName` production

(Additionally, there are historical references to the `Char` and `Name` production, and how we _don't_ validate against them.)

I suspect in both cases you can create PIs/doctypes that violate these rules using the HTML parser, so we could consider doing something similar to #1079.

However, the priority here is significantly lower than for attributes and elements.

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