Further work. Compiles. WIP
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index fa46adc..5f6998f 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -807,9 +807,14 @@
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/security/auth_context.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/string_ref.h \
+include/grpc++/impl/codegen/sync.h \
+include/grpc++/impl/codegen/sync_cxx11.h \
+include/grpc++/impl/codegen/sync_no_cxx11.h \
include/grpc++/impl/codegen/time.h \
src/cpp/client/secure_credentials.h \
src/cpp/common/secure_auth_context.h \