[css-easing-1][editorial] Added WPT

Author: SebastianZ

css-easing-1/Overview.bs

@@ -505,8 +505,11 @@ Rachel Nabors, Martin Pitt, and the <a
 href="https://damp-lake-50659.herokuapp.com/">Animation at Work</a> slack
 community for their feedback and contributions.
 
-<!-- Level 2 tests -->
-<wpt hidden>
+<wpt hidden title="Level 2 tests">
   linear-timing-functions-output.html
   linear-timing-functions-syntax.html
+</wpt>
+
+<wpt hidden title="non-specific crashers">
+  linear-timing-functions-chrome-406926307-crash.html
 </wpt>