embeddedobj: document OCommon/DummyEmbeddedObject

Change-Id: Ia0024945fa88c14dce4da571ddfd3281e1e41da7
Reviewed-on: https://gerrit.libreoffice.org/55022Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

embeddedobj/source/inc/commonembobj.hxx

@@ -72,6 +72,10 @@ namespace comphelper {
 
 class Interceptor;
 
+/**
+ * Represents an OLE object that has native data and we loaded that data into a
+ * document model successfully.
+ */
 class OCommonEmbeddedObject : public css::embed::XEmbeddedObject
                             , public css::embed::XEmbedPersist2
                             , public css::embed::XLinkageSupport

embeddedobj/source/inc/dummyobject.hxx

@@ -48,6 +48,10 @@ namespace cppu {
     class OMultiTypeInterfaceContainerHelper;
 }
 
+/**
+ * Represents an OLE object that has native data (next to the replacement
+ * image), but we don't understand that data.
+ */
 class ODummyEmbeddedObject : public ::cppu::WeakImplHelper
                         < css::embed::XEmbeddedObject
                         , css::embed::XEmbedPersist >