Fix errors in DoC, and linkify things

Author: fantasai

css3-values/Overview.src.html

@@ -1465,10 +1465,10 @@ <h2 id="limits">
 	<p>
 		Values outside the supported range must be clamped into the supported range.
 		Values specified with an unsupported amount of precision must be rounded
-		to the closest supported value;
+		to the closest supported value when parsed;
 		except that values that are not equal to, but would round to,
 		either zero or the boundary of a closed range,
-		are rounded away from that value rather than to it.
+		should be rounded away from that value rather than to it.
 
 	<div class="example">
 		<p>