[css-display] Bikeshed fixes.

Author: tabatkins

css-display/Overview.bs

@@ -21,7 +21,12 @@ At Risk: All two-keyword values of 'display' and ''display: inline-list-item''
 </pre>
 <pre class="link-defaults">
 spec:css-break-3; type:dfn; text:fragment;
-spec:css22; type:property; text:overflow;
+spec:css22;
+	type:property; text:overflow;
+	type:dfn;
+		text: table wrapper box
+		text: table box
+spec: html; type: dfn; text: rendered legend
 </pre>
 
 <h2 id="intro">
@@ -922,3 +927,8 @@ Changes</h2>
 			like ''::after { clear: both; }'' and ''overflow: hidden''
 			that are intended to accomplish this purpose.)
 	</ul>
+
+Privacy and Security Considerations {#priv-sec}
+===============================================
+
+This specification introduces no new privacy or security considerations.