add /satie/synthdefs to OSC-API documentation
https://gitlab.com/sat-mtl/tools/satie/satie/-/merge_requests/513 introduces a new OSC message, which should be added to the OSC documentation and OSC-API dump system
https://gitlab.com/sat-mtl/tools/satie/satie/-/merge_requests/513 introduces a new OSC message, which should be added to the OSC documentation and OSC-API dump system