Update comments only in the MSP430X IAR main.c and serial.c files.

Demo/MSP430X_MSP430F5438_IAR/main.c

@@ -239,10 +239,10 @@ typedef struct
 
 /*-----------------------------------------------------------*/
 
-/* The linker script tests the FreeRTOS ports use of 20bit addresses by
-locating all code in high memory.  The following pragma ensures that main
-remains in low memory.  The ISR_CODE segment is used for convenience as ISR
-functions are always placed in low memory. */
+/* The linker script can be used to test the FreeRTOS ports use of 20bit 
+addresses by locating all code in high memory.  The following pragma ensures 
+that main remains in low memory when that is done.  The ISR_CODE segment is used 
+for convenience as ISR functions are always placed in low memory. */
 #pragma location="ISR_CODE"
 void main( void )
 {

Demo/MSP430X_MSP430F5438_IAR/serial.c

@@ -157,6 +157,12 @@ signed portBASE_TYPE xReturn;
 }
 /*-----------------------------------------------------------*/
 
+/* The implementation of this interrupt is provided to demonstrate the use
+of queues from inside an interrupt service routine.  It is *not* intended to
+be an efficient interrupt implementation.  A real application should make use
+of the DMA.  Or, as a minimum, transmission and reception could use a simple
+RAM ring buffer, and synchronise with a task using a semaphore when a complete
+message has been received or transmitted. */
 #pragma vector=USCI_A1_VECTOR
 static __interrupt void prvUSCI_A1_ISR( void )
 {