Administration: CSS coding standards: use double quotes for values that require quotes.

As per the WordPress CSS coding standards, CSS properties with values that require quotes must use double quotes.
Also fixes some indentation and spacing.

Fixes #43220.

Built from https://develop.svn.wordpress.org/trunk@42641


git-svn-id: http://core.svn.wordpress.org/trunk@42470 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/edit.css

@@ -214,7 +214,7 @@ ul.category-tabs li,
 
 /* Back-compat for pre-4.4 */
 #category-adder h4 {
-    margin: 0;
+	margin: 0;
 }
 
 .taxonomy-add-new {
@@ -1122,7 +1122,7 @@ p.popular-tags a {
 }
 
 .comment-ays .comment-content a[href]:after {
-	content: '(' attr( href ) ')';
+	content: "(" attr( href ) ")";
 	display: inline-block;
 	padding: 0 4px;
 	color: #72777C;
@@ -1135,7 +1135,7 @@ p.popular-tags a {
 }
 
 .comment-ays .comment-content p.edit-comment a[href]:after {
-	content: '';
+	content: "";
 	padding: 0;
 }