[css-snappoints] Removing wiki link for issue tracking, since it's not actually used

Author: ChumpChief

css-snappoints/Overview.bs

@@ -11,7 +11,6 @@ ED: http://dev.w3.org/csswg/css-snappoints/
 Editor: Matt Rakow, Microsoft
 Editor: Jacob Rossi, Microsoft
 Abstract: This module contains features to control panning and scrolling behavior with "snap positions".
-!Issue Tracking: <a href="http://wiki.csswg.org/spec/css-snappoints">http://wiki.csswg.org/spec/css-snappoints</a>
 Ignored Terms: scroll-snap-positions-*, containing block chain
 </pre>