Docs: Update JavaDoc

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/CityObject.java

@@ -70,10 +70,13 @@ public abstract class CityObject extends GmlElement {
     public abstract AbstractCityObject getGmlObject();
 
     /**
-     * Remove the CityGML4j geometries from the data structure to save memory.
+     * Remove the CityGML4j geometries from this CityObject to save memory.
      */
     public abstract void unsetGmlGeometries();
 
+    /**
+     * Removes all CityGML4J geometries from this CityObject and all children in its datastructure.
+     */
     public final void clearGmlGeometries() {
         this.accept(new UnsetGeometriesVisitor());
     }