Remove incorrect comment from ncproxy grpc service struct
Remove incorrect comment from ncproxy grpc service struct

The GRPC service doesn't hold a mutex. This was left in from an older iteration
where the client map would get updated in the grpc service.

Signed-off-by: Daniel Canter <8d0fd95ae71f7e4870b010b10f83a6201b034a65@microsoft.com>

Microsoft/hcsshim