Fix misstype in [--cpp-client-file] option example
Fix misstype in [--cpp-client-file] option example

cinemast/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,jmassey-jacques/libjson-rpc-cpp,cinemast/libjson-rpc-cpp,cinemast/libjson-rpc-cpp