Correct mistake in aria-description pointed out in issue 1186. (#1193)

The aria-description property should apply to the same elements
that aria-describedby applies to, which is all elements of the
base markup.

index.html

@@ -10913,7 +10913,7 @@ <h2>Definitions of States and Properties (all aria-* attributes)</h2>
 					</tr>
 					<tr>
 						<th class="property-applicability-head" scope="row">Used in Roles:</th>
-						<td class="property-applicability">All elements of the base markup except for some roles or elements that prohibit its use</td>
+						<td class="property-applicability">All elements of the base markup</td>
 					</tr>
 					<tr>
 						<th class="property-descendants-head" scope="row">Inherits into Roles:</th>