NAU7802: Doxygen comments for flush method

Author: tyeth

src/components/i2c/drivers/WipperSnapper_I2C_Driver_NAU7802.h

@@ -100,6 +100,8 @@ class WipperSnapper_I2C_Driver_NAU7802 : public WipperSnapper_I2C_Driver {
   /*******************************************************************************/
   /*!
       @brief    Gets datapoints from sensor and discards (flushes old data).
+      @param    count
+                Number of readings to discard.
   */
   /*******************************************************************************/
   void flushNAU7802(uint8_t count) {