Added stripes() function to Changes sections

Author: SebastianZ

css-backgrounds-4/Overview.bs

@@ -711,6 +711,7 @@ Additions Since Level 3</h3>
 		<li>logical 'background-position' values (''background-position/start'', ''background-position/end'')
 		<li>the ''extend'' keyword of 'background-repeat'
 		<li>'corner-shape'
+		<li><<stripes()>> as value for ''border-color'' and its longhands
 		<li>multiple border colors per border
 		<li>logical border properties
 		<li><a href="#partial-borders">Partial Borders</a> (make part of border shorthand as well!)

css-images-4/Overview.bs

@@ -2501,7 +2501,7 @@ Changes {#changes}
 - Switched color-stop grammar to repeat at end for readability
 - Clarified that object-fit and image-resolution use discrete animation
 - Fixed definition of cross-fade() image blending
-- Added placeholder section for the stripes() function
+- Added stripes() function and added it to <image> data type
 - Moved interpolation of images from [[css3-images]]
 - Clarifed that cross-fade() takes 1+ arguments. Defined sizing and painting of the new function arguments in detail.
 - Moved cross-fade() from [[css3-images]]

css-ui-4/Overview.bs

@@ -2542,12 +2542,15 @@ the following normative changes have been made:
 
 <ul>
 	<li>
-		Introduce a definition for the 'pointer-events' property.
+		Introduced a definition for the 'pointer-events' property.
 
 	<li>
 		Extend the image types required to be supported for the 'cursor' property
 		from just <<url>> to <<url>> and <<url-set>>.
 		(Support for the broader <<image>> type remains allowed but optional.)
+
+	<li>
+		Added <<stripes()>> as value for the 'outline-color' property.
 </ul>
 
 <h3 id=changes-24-1-2020 class=no-num>Changes from the