[css-module-bikeshed] Use and mention the Issue: syntax for creating issues.

Author: dbaron

css-module-bikeshed/Overview.bs

@@ -151,15 +151,15 @@ Internal display model: the 'foo' property {#the-foo-property}
 
 	Don't forget to write the alt.
 
-	<p class='issue'>
-		An open issue or editorial remark is OK in a WD,
-		but they should be resolved/removed before the document goes to &ldquo;CR&rdquo;
-		(Candidate Recommendation).
-		Use class=&ldquo;issue&rdquo;.
-
-	<p class='issue'>
-		Inline issues will be copied into an <a href="#issues-index">Issues Index</a> at the end of the document,
-		for easy reference.
+	Issue: An open issue or editorial remark is OK in a WD,
+	but they should be resolved/removed before the document goes to &ldquo;CR&rdquo;
+	(Candidate Recommendation).
+	Use class=&ldquo;issue&rdquo; on an element,
+	or begin a paragraph with &ldquo;Issue:&rdquo;.
+
+	Issue:
+	Inline issues will be copied into an <a href="#issues-index">Issues Index</a> at the end of the document,
+	for easy reference.
 
 	<pre class='idl'>
 		/* Write WebIDL in a &lt;pre class="idl"> as plain text. */