[css-text-3] [css-text-4] word-wrap defined both as property and legacy name alias

[tidoust]

In the two levels, the word-wrap property is defined together with overflow-wrap in the same definition table. That defines the property as a real one, different from overflow-wrap.

But the table is followed by text that defines word-wrap as a legacy name alias of the overflow-wrap property.

I suspect the property should only be defined as a legacy name alias (consistent with how such legacy properties are defined in css-align-3, css-fonts-4 and css-ui-4).