[w3c/webcomponents] Note about "custom" is misleading (#461)

"Custom" in custom elements is defined as an element having its "custom flag" set. However, for upgrades that flag is only set together with the "defined flag". So you cannot say that a custom element becomes defined once it's upgraded, because it's only at that point that it becomes a custom element. Before that it's just an element.

We might want to have a way to refer to elements that are likely upgraded though. E.g., a "prolly-custom element".

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