Editorial: Add note to fallback table noting where non-required impli…

…cit values are located (#1067)

index.html

@@ -12908,7 +12908,7 @@ <h3>States and Properties</h3>
 				<tr>
 					<td><rref>separator</rref> (if focusable)</td>
 					<td><pref>aria-valuenow</pref></td>
-					<td><code>aria-valuemax - aria-valuemin) / 2</code></td>
+					<td><code>(aria-valuemax - aria-valuemin) / 2</code></td>
 				</tr>
 				<tr>
 					<td><rref>scrollbar</rref></td>
@@ -12947,6 +12947,7 @@ <h3>States and Properties</h3>
 				</tr>
 			</tbody>
 		</table>
+		<p class="note">Implicit Values for non-required states and properties appear in the characteristics table for each role. These are not considered fallback values so are not included here.</p>
 	</section>
 </section>
 <section id="idl-interface" class="normative">