refactor: remove hash to combobox input

Author: andrewseguin

src/dev-app/aria-docs-examples/aria-docs-examples.html

@@ -59,8 +59,7 @@ <h2>
 <h1>Combobox</h1>
 
 <div ngCombobox #combobox="ngCombobox">
-  <input ngComboboxInput #comboboxInput="ngComboboxInput"
-         #inputElement/>
+  <input ngComboboxInput #inputElement/>
 
   <ng-template
       [cdkConnectedOverlay]="{origin: inputElement, usePopover: true, matchWidth: true}"