[chore] Preferences: Make autocomplete description sound less casual (#4908)

searx/templates/simple/preferences/autocomplete.html

@@ -12,6 +12,6 @@
     </select>{{- '' -}}
   </div>{{- '' -}}
   <div class="description">
-    {{- _('Find stuff as you type') -}}
+    {{- _('Show possible queries as you type') -}}
   </div>{{- '' -}}
 </fieldset>{{- '' -}}