Issue Description:

If you have this code in Swift:

import Foundation
public class Templateer: NSObject {
  /**
  Do something with template

  - parameter template: the template
  */
  @objc public func doSomething(template: String) {}
}

it'll end up putting this in the ObjC generated header:

/// Do something with template
/// \param template the template
///
- (void)doSomethingWithTemplate:(NSString * _Nonnull)template_;

The parameter name "template" got renamed to "template_", but the docs didn't get updated. Either PrintAsObjC's printDocumentationComment should account for this, or ide::getDocumentationCommentAsDoxygen should assume it needs to do the same kind of escaping that PrintAsObjC does. (The first is probably better.)