[editing] Definition of legal caret positions before/after inline elements is unclear (#74)

> * After inline elements that are not text nodes.
> * Before inline elements that are not text nodes and that do not have a `previousSibling`.

I find this a bit confusing:

1. Elements cannot be text nodes, so I think that saying "After inline elements" is enough.
2. The second point mentions `previousSibling`, while the first one doesn't. Is there a specific reason why it is formulated this way?

Couldn't it be formulated this way: "After and before inline elements"?

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https://github.com/w3c/editing/issues/74