[css-content] remove datetime and documenturl sections

Author: dauwhe

css-content/Overview.bs

@@ -429,43 +429,6 @@ would produce:
 
 
 
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-<h3 id=content-datetime>
-datetime
-</h3>
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-
-	<pre class="prod">
-		<dfn>datetime</dfn> = [ date() | time() ];
-	</pre>
-
-	<dl dfn-for="content, <content-list>" dfn-type=value>
-		<dt>datetime
-		<dd>Dates and times can be specified with two functions, 'date()' and 'time()'.
-	</dl>
-
-	Issue: need more details on the separate functions. How are they defined? How are they formatted?
-
-<h3 id="content-document-url">
-document-url
-</h3>
-
-	<dl dfn-for="content, <content-list>" dfn-type=value>
-		<dt><dfn>document-url</dfn>
-		<dd>The URI of the current document. For local files, this may simply be the local file name.
-	</dl>
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-
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 <h3 id="leaders">
 Leaders</h3>