code: void writeReturnComment(TypeMirror returnType, Writer writer) throws IOException {
  		String type = returnType.toString();
  		if (!"void".equals(type)) {
  			writer.append(TAB2).append(" * @return ").append(OPENBRACE).append(type).append(CLOSEBRACE).append(CR);
  		}
  	}
docs: write js documentation for return type
  @param returnType
  @param writer
  @throws IOException