Move workaround_list to grpc_base
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index b881783..5bae9fa 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -900,6 +900,7 @@
 include/grpc/slice.h \
 include/grpc/slice_buffer.h \
 include/grpc/status.h \
+include/grpc/support/workaround_list.h \
 src/core/lib/channel/channel_args.c \
 src/core/lib/channel/channel_args.h \
 src/core/lib/channel/channel_stack.c \