individual sound effect functions private

-to reduce suggested function lists while writing code

Author: lewispg228

src/sfeQwiicBuzzer.h

@@ -95,6 +95,7 @@ class sfeQwiicBuzzerArdI2C
         /// @return 0 for succuss, negative for errors, positive for warnings        
         sfeTkError_t playSoundEffect(const uint8_t &soundEffectNumber, const uint8_t &volume);
 
+    private:
         /// @brief Plays sound effect 0
         /// @param volume Volume (4 settings; 0=off, 1=quiet... 4=loudest)
         /// @return 0 for succuss, negative for errors, positive for warnings