Encourage always-escaping ampersand character. #11988
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In the example highlighting ambiguities from missing semicolons on named character references, a "correct" encoding is provided, but that example makes no mention of the fact that the fragment was ambiguous precisely because the ampersand wasn't escaped.
This patch adds a clarifying note explaining how this situation is avoided by always escaping the ampersand.
(See WHATWG Working Mode: Changes for more details.)