Add documentation for setupPortList() now that I modified it.

src/ui/SerialConfigurationWindow.h

@@ -60,6 +60,12 @@ public slots:
     void setParityEven(bool accept);
     void setPortName(QString port);
     void setLinkName(QString name);
+    /**
+     * @brief setupPortList Populates the dropdown with the list of available serial ports.
+     * This function is called at 1s intervals to check that the serial port still exists and to see if
+     * any new ones have been attached.
+     * @return True if any ports were found, false otherwise.
+     */
     bool setupPortList();
 
 protected: