Correct title case

Author: chengweih001

index.bs

@@ -5908,7 +5908,7 @@ To <dfn>trigger a gatt connection attempted event</dfn> given a [=navigable=] |n
 
 </div>
 
-#### The bluetooth.characteristicEventGenerated Event #### {#bluetooth-characteristicEventGenerated-event}
+#### The bluetooth.characteristicEventGenerated Event #### {#bluetooth-characteristiceventgenerated-event}
 
 <pre highlight="cddl" class="cddl local-cddl">
 bluetooth.CharacteristicEventGenerated = (