Wrong warning of Doxygen

Steps to reproduce

Build documentation using Doxygen 1.13.2.

Expected behavior

No warnings are generated.

Current behavior

Following warnings are generated. Lines at which warnings are generated are functions which actually return values.

/workspaces/cpp-msgpack-rpc/include/msgpack_rpc/clients/call_future.h:89: warning: found documented return type for msgpack_rpc::clients::CallFuture< void >::get_from_call_result that does not return anything
/workspaces/cpp-msgpack-rpc/include/msgpack_rpc/clients/call_future.h:56: warning: found documented return type for msgpack_rpc::clients::CallFuture< void >::get_result that does not return anything
/workspaces/cpp-msgpack-rpc/include/msgpack_rpc/clients/call_future.h:71: warning: found documented return type for msgpack_rpc::clients::CallFuture< void >::get_result_within that does not return anything

Note