[css-text-4] Examples 1 and 2 use 'text-space-collapse' where there should be 'text-space-trim'

[Example 1](https://drafts.csswg.org/css-text-4/#example-e1d8a8e3) and [example 2](https://drafts.csswg.org/css-text-4/#example-e8c75ed4) of Text Level 4 use `text-space-collapse` with values, which are defined for `text-space-trim`.

Sebastian
