Update URL of AAC

symbols/index.html

@@ -22,7 +22,7 @@
 				<li>Need more familiar icons (and other graphical symbols) in order to comprehend page content;</li>
 			</ul>
 
-			<p>The technology described in this specification is intended to be used to programmatically transform the appearance of typical web content including form controls, icons, and other user interface elements	into a rendering incorporating an individual user's preferred AAC symbols. The W3C <a href="https://www.w3.org/TR/adapt-registry/">WAI-Adapt Symbols Registry</a> provides the required mappings between concept values used by content authors and the user's preferred AAC symbol set representation of that concept.</p>
+			<p>The technology described in this specification is intended to be used to programmatically transform the appearance of typical web content including form controls, icons, and other user interface elements	into a rendering incorporating an individual user's preferred AAC symbols. The W3C <a href="https://www.w3.org/TR/aac-registry/">WAI-Adapt Symbols Registry</a> provides the required mappings between concept values used by content authors and the user's preferred AAC symbol set representation of that concept.</p>
 			<p>This WAI-Adapt: Symbols Module is a component of the WAI-Adapt series introduced in the <a href="https://www.w3.org/TR/adapt/">WAI-Adapt Explainer</a> document [[adapt]].</p>
 		</section>