[w3c/uievents-key] Use of uppercase hex for code points (editorial) (Issue #60)

Stylistic conventions
https://w3c.github.io/uievents-key/#style-conventions

> Unicode [[Unicode]](https://w3c.github.io/uievents-key/#biblio-unicode) code points are shown as: U+003d.

I18N recommends the use of uppercase for hexadecimal code point references (we also recommend showing the character and the character name when that will reduce confusion). For more info, see this section in our Best Practices doc: https://w3c.github.io/bp-i18n-specdev/#char_ref

Note that to address this issue you will need to go through your spec and fix the various `U+abcd` references to use uppercase. I happened to notice that all of your references are in lowercase currently.

(This is an editorial comment.)

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