Allow WebKit browsers to break strings in `<code>` tags.

This prevents an overflow for example on Permalink Settings.

fixes #28161.
Built from https://develop.svn.wordpress.org/trunk@29501


git-svn-id: http://core.svn.wordpress.org/trunk@29279 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/common-rtl.css

@@ -3055,6 +3055,10 @@ img {
 		left: -190px;
 	}
 
+	code {
+		word-wrap: break-word;
+	}
+
 	/* General Metabox */
 	.postbox {
 		font-size: 14px;

wp-admin/css/common.css

@@ -3055,6 +3055,10 @@ img {
 		right: -190px;
 	}
 
+	code {
+		word-wrap: break-word;
+	}
+
 	/* General Metabox */
 	.postbox {
 		font-size: 14px;