Edited Issue: [HelpPage]Xml documentation on request body parameter missing from help page [1460]

For the following action, HelpPage UI is missing the xml comment information about the parameter 'person'.

The xml comment "Updated person information" should show up.

```
/// <summary>
/// Updates an existing person
/// </summary>
/// <param name="id">Id of th epreson</param>
/// <param name="person">Updated person information</param>
/// <returns>No content is returned</returns>
[ResponseType(typeof(void))]
public async Task<IHttpActionResult> PutPerson(int id, Person person)
```

Person entity:
```
/// <summary>
/// Represents a person class
/// </summary>
public class Person
{
/// <summary>
/// Id of th eperson
/// </summary>
public int Id { get; set; }

/// <summary>
/// Name of the person
/// </summary>
public string Name { get; set; }
}
```

__Attached__ a snapshot.