feat(core): add notes

src/address/address.h

@@ -29,6 +29,7 @@ LINPHONE_BEGIN_NAMESPACE
 class AddressPrivate;
 
 class LINPHONE_PUBLIC Address : public ClonableObject {
+	// TODO: Remove me later.
 	friend class CallSession;
 	friend class ClientGroupChatRoom;
 

src/content/content-type.cpp

@@ -16,9 +16,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "content-type.h"
 #include "object/clonable-object-p.h"
 
+#include "content-type.h"
+
 // =============================================================================
 
 using namespace std;