[css-ui-4] Fixed links to other specs in outline-color definition

Author: SebastianZ

css-ui-4/Overview.bs

@@ -293,8 +293,8 @@ Applies to: all elements
 Inherited: no
 Percentages: N/A
 Computed value: The computed value for ''outline-color/invert'' is ''outline-color/invert''.
- For <<color>> values, see [[!CSS-COLOR-4#resolving-color-values]] in [[!CSS-COLOR-4]].
- For <<1d-image>> values, see [[!CSS-IMAGES-4#stripes]] in [[!CSS-IMAGES-4]].
+ For <<color>> values, see [[css-color-4#resolving-color-values]] in [[!CSS-COLOR-4]].
+ For <<1d-image>> values, see [[css-images-4#stripes]] in [[!CSS-IMAGES-4]].
 Animation type: by computed value
 </pre>