[w3c/uievents-key] Mention modern usage of Esc (#23)

> `"Escape"` | The Escape (Esc) key, to initiate an escape sequence.
> --- | ---

Since that use is nearly obsolete among non-technical end-users, consider also mentioning [more modern usages](https://en.wikipedia.org/wiki/Esc_key#Uses) of the Esc key.

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