[css-position-3][editorial] bikeshed cleanup

Author: tabatkins

css-position-3/Overview.bs

@@ -20,6 +20,8 @@ Link Defaults: css-transforms-1 (property) transform
 </pre>
 <pre class=link-defaults>
 spec:css-writing-modes-4; type:dfn; text:end
+spec:css2; type:value; for:float; text:none
+spec:css-align-3; type:value; for:align-self; text:center
 </pre>
 
 <style type="text/css">