Fixed syntax error in example AutocompleteHandler

docs/guides/int_framework/samples/autocompletion/autocomplete-example.cs

@@ -1,6 +1,6 @@
 // you need to add `Autocomplete` attribute before parameter to add autocompletion to it
 [SlashCommand("command_name", "command_description")]
-public async Task ExampleCommand([Summary("parameter_name"), Autocomplete(typeof(ExampleAutocompleteHandler))] string parameterWithAutocompletion)
+public async Task ExampleCommand([Summary("parameter_name"), [Autocomplete(typeof(ExampleAutocompleteHandler))] string parameterWithAutocompletion)
     => await RespondAsync($"Your choice: {parameterWithAutocompletion}");
 
 public class ExampleAutocompleteHandler : AutocompleteHandler
@@ -17,4 +17,4 @@ public class ExampleAutocompleteHandler : AutocompleteHandler
         // max - 25 suggestions at a time (API limit)
         return AutocompletionResult.FromSuccess(results.Take(25));
     }
-}
+}