Fix comment in M115 code

Marlin/Marlin_main.cpp

       SERIAL_PROTOCOLLNPGM("Cap:LEVELING_DATA:0");
     #endif
 
-    // SOFTWARE_POWER (G30)
+    // SOFTWARE_POWER (M80, M81)
     #if HAS_POWER_SWITCH
       SERIAL_PROTOCOLLNPGM("Cap:SOFTWARE_POWER:1");
     #else