[css-values-4] Filled in Changes section.

Author: tabatkins

css-values-4/Overview.bs

@@ -2645,6 +2645,17 @@ Registration for the <code>about:invalid</code> URL scheme</h3>
 	</table>
 
 
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 <h2 class="no-num" id="acknowledgments">
 Acknowledgments</h2>
 
@@ -2666,8 +2677,14 @@ Changes</h2>
 
 	<ul>
 		<li>Added the ''vi'', ''vb'', ''ic'', ''cap'', ''lh'' and ''rlh'' units.
-		<li>Added ''min()'' and ''max()'' functional notations.
+		<li>Added ''min()'', ''max()'', and ''clamp()'' functional notations.
 		<li>Added unit arithmetic to ''calc()''.
+		<li>Added ''toggle()'' (punted from level 3 originally).
+		<li>Added [[#calc-type-checking|unit algebra]],
+			cribbing from [[css-typed-om-1]].
+		<li>A non-integer in a calc() automatically rounds to the nearest integer
+			when used where an <<integer>> is required.
+		<li>Defined [[#calc-serialize|serialization]] of [=math functions=].
 	</ul>
 
 <h2 class="no-num" id="sec-pri">