[css-color-hdr] Removed erroneous negative chroma reference range

Author: svgeesus

css-color-hdr-1/Overview.bs

@@ -893,7 +893,7 @@ Mixing Dynamic Range Limits: the ''dynamic-range-limit-mix()'' function {#dynami
 			<tr>
 				<th>Percent reference range</th>
 				<td>for Jz: 0% = 0.0, 100% = 1.0<br>
-				for Cz: -100% = -0.26, 100% = 0.26</td>
+				for Cz: 100% = 0.26</td>
 			</tr>
 		</table>