made codegen targets in build.yaml
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 92080e6..fa46adc 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -769,14 +769,6 @@
 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 \
@@ -811,6 +803,14 @@
 include/grpc++/support/stub_options.h \
 include/grpc++/support/sync_stream.h \
 include/grpc++/support/time.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 \
 src/cpp/client/secure_credentials.h \
 src/cpp/common/secure_auth_context.h \
 src/cpp/server/secure_server_credentials.h \