Merging Obj-C property and custom setter docs

[dashchak]

In our SDK we have readonly property:
@property (nonatomic, readonly) NSUInteger routeRequestInterval;

and custom non-void setter in order to return some error:
-(NMANavigationError)setRouteRequestInterval:(NSUInteger)interval;

Doc is generated only for property. Setter is not shown at all.

Looks like a SourceKitten filtering issue as docs are generated by Xcode when I Opt+click the property or setter.
We can not modify property or setter as they are in public header of SDK and will affect users.

Is there any workaround?