Revert changes to css-contain-1 and css-ui-3

Author: xfq

css-contain-1/Overview.bs

@@ -23,6 +23,7 @@ spec: css2; urlPrefix: https://www.w3.org/TR/CSS2/
 	type: value; for: content; url: generate.html#value-def-close-quote; text: close-quote
 	type: value; for: content; url: generate.html#value-def-no-open-quote; text: no-open-quote
 	type: value; for: content; url: generate.html#value-def-no-close-quote; text: no-close-quote
+	type: dfn; url: box.html#padding-edge; text: padding edge
 
 spec: css-backgrounds-3;
 	type: dfn; url: https://drafts.csswg.org/css-backgrounds-3/#corner-clipping; text: corner clipping

css-ui-3/Overview.bs

@@ -81,6 +81,7 @@ spec:css2; type:property; text:background-image
 <!-- Some of the following definitions have existing exported defintions from other specs,
 but not from specs that are OK to link to from a CR -->
 <pre class="anchors">
+url: https://www.w3.org/TR/CSS2/box.html#border-edge; type: dfn; spec: CSS2; text: border edge
 url: https://www.w3.org/TR/CSS2/visufx.html#propdef-overflow
     type: property; spec: CSS2; text: overflow
     type: value; spec: CSS2; text: visible; for: overflow