[ddehilster]

Documents VisualText/nlp-engine#783 (#427) on the _xWILD page.

The new text covers three points:

• An unrestricted wildcard stops at the first node the elements after it can match, and matching never backs up.
• From 4.2.27, when an optional element follows the wildcard, a later element (up to the next required one) also stops it, and the optional element is then absent.
• On a tie at the same node, the optional element is used.

I ran the example on the page through the 4.2.27 build: on "the big bears met three bears" the rule matches "the big bears", as the page says. On 4.2.18 the same rule doesn't match at all, which is what the "before" sentence describes.

Merge after nlp-engine#783.

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