Made "codedgen" directories closed over #includes
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 7ec8a0e..92080e6 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -769,8 +769,14 @@
include/grpc++/grpc++.h \
include/grpc++/impl/call.h \
include/grpc++/impl/client_unary_call.h \
+include/grpc++/impl/codegen/call_hook.h \
include/grpc++/impl/codegen/channel_interface.h \
+include/grpc++/impl/codegen/completion_queue_tag.h \
+include/grpc++/impl/codegen/config.h \
include/grpc++/impl/codegen/server_interface.h \
+include/grpc++/impl/codegen/status.h \
+include/grpc++/impl/codegen/status_code_enum.h \
+include/grpc++/impl/codegen/time.h \
include/grpc++/impl/grpc_library.h \
include/grpc++/impl/method_handler_impl.h \
include/grpc++/impl/proto_utils.h \