[css-inline-3] Fix applies-to of baseline-shift

Author: fantasai

css-inline-3/Overview.bs

@@ -769,7 +769,7 @@ Post-Alignment Shift: the 'baseline-shift' longhand</h4>
 	Name: baseline-shift
 	Value: <<length-percentage>> | sub | super
 	Initial: 0
-	Applies to: inline-level boxes, flex items, grid items, and SVG <a>text content elements</a>
+	Applies to: inline-level boxes and SVG <a>text content elements</a>
 	<!-- table cells left out b/c CSS2.1 vertical-align values must have no effect... -->
 	Inherited: no
 	Percentages: refer to the used value of 'line-height'