Fix commentaries and missing EOF

src/client-agent/start_agent.c

src/config/client-config.c

src/config/client-config.h

src/unit_tests/agent.cmake

src/unit_tests/winagent.cmake

src/unit_tests/wrappers/client-agent/start_agent.c

src/unit_tests/wrappers/client-agent/start_agent.h