code: public final JSDocInfo getOwnPropertyJSDocInfo(String propertyName) {
      Property p = getOwnSlot(propertyName);
      return p == null ? null : p.getJSDocInfo();
    }
docs: Gets the docInfo on the specified property on this type.  This should not
  be implemented recursively, as you generally need to know exactly on
  which type in the prototype chain the JSDocInfo exists.