move comment to fix compile error

Marlin/src/inc/SanityCheck.h

@@ -1491,7 +1491,8 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
       || ENABLED(E3_IS_TMC2208) \
       || ENABLED(E4_IS_TMC2208 ) )
     #error "HAVE_TMC2208 requires at least one TMC2208 stepper to be set."
-  #elif ENABLED(ENDSTOP_INTERRUPTS_FEATURE) && \  // Software UART and ENDSTOP_INTERRUPTS both use Pin Change interrupts (PCI)
+  // Software UART and ENDSTOP_INTERRUPTS both use Pin Change interrupts (PCI)
+  #elif ENABLED(ENDSTOP_INTERRUPTS_FEATURE) && \
       !( defined( X_HARDWARE_SERIAL) \
       || defined(X2_HARDWARE_SERIAL) \
       || defined( Y_HARDWARE_SERIAL) \