Incorrect Javadoc comment in HttpTrigger.java

The following Javadoc describes the HttpTriger route method, but the sample described is incorrect and causes a compile error.

https://docs.microsoft.com/en-us/java/api/com.microsoft.azure.functions.annotation.httptrigger.route?view=azure-java-stable#com_microsoft_azure_functions_annotation_HttpTrigger_route__

The correct method type is `HttpResponseMessage`, not `HttpResponseMessage`.

```java
@FunctionName("routeTest")
public HttpResponseMessage routeTest(
@HttpTrigger(name = "req",
methods = {HttpMethod.GET},
authLevel = AuthorizationLevel.ANONYMOUS,
route = "products/{category:alpha}/{id:int}")
HttpRequestMessage> request,
@BindingName("category") String category,
@BindingName("id") int id,
final ExecutionContext context
) {
....
context.getLogger().info("We have " + category + " with id " + id);
....
}
```

This Javadoc is probably auto-generated from the following link.
Please fix it.

https://github.com/Azure/azure-functions-java-library/blob/dev/src/main/java/com/microsoft/azure/functions/annotation/HttpTrigger.java#L140

Apri src/main/java/com/microsoft/azure/functions/annotation/HttpTrigger.java intorno alla riga 140 e confronta l’esempio Javadoc con la documentazione delle route collegata. Correggi il tipo restituito dell’esempio in modo che corrisponda al tipo di metodo indicato, quindi verifica che l’esempio Javadoc non contenga più l’errore di compilazione segnalato.

Scritto dal modello di indicizzazione a partire dal testo della issue.