Added ` EXTENDED_M20` to RepRap Gcode wiki `M115` see https://reprap.org/mediawiki/index.php?title=G-code&type=revision&diff=189034&oldid=189033

Firmware/Marlin_main.cpp

@@ -3965,7 +3965,6 @@ static void extended_capabilities_report()
     cap_line(PSTR("AUTOREPORT_POSITION"), ENABLED(AUTO_REPORT));
     // EXTENDED_M20 (support for L and T parameters)
     cap_line(PSTR("EXTENDED_M20"), 1);
-    //@todo Update RepRap cap
 }
 #endif //EXTENDED_CAPABILITIES_REPORT