New try arduino-libraries#2

Author: Alrik Vidstrom

src/Arduino_LowPowerPortentaH7.h

@@ -331,7 +331,7 @@ class LowPowerPortentaH7 {
                  LowPowerReturnCode>::type
         standbyM7(const T standbyType, const Args... args) const;
         /// @endcond
-        #ifdef DOXYGEN
+        #ifdef VISIBLE_ONLY_TO_DOXYGEN
         /**
         * @brief Make the M7 core enter Standby Mode.
         * @param standbyType One or a combination of LowPowerStandbyType::untilPinActivity