[css-text-decor-3] Drop dropped features from at-risk list.

Author: fantasai

css-text-decor-3/Overview.bs

@@ -14,8 +14,6 @@ Issue Tracking: Tracker http://www.w3.org/Style/CSS/Tracker/products/10
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
 Editor: Koji Ishii, Google, kojiishi@gmail.com, w3cid 45369
 Abstract: This module contains the features of CSS relating to text decoration, such as underlines, text shadows, and emphasis marks.
-At Risk: The 'text-decoration-skip' property.
-At Risk: The line positioning rules.
 At Risk: The ability to place both emphasis marks and ruby on the same base text.
 Link Defaults: css-color-3 (property) color
 Use <i> Autolinks: yes