adding doxygen comments to new functions

Author: tony-josi-aws

source/FreeRTOS_IP_Utils.c

@@ -134,6 +134,14 @@ static void prvSetChecksumInPacket( struct xPacketSummary * pxSet,
 
 static uint16_t prvGetChecksumFromPacket( const struct xPacketSummary * pxSet );
 
+/**
+ * @brief Set checksum in the packet
+ *  
+ * @param pxSet: Pointer to the packet summary that describes the packet,
+ *                  to which the checksum will be set.
+ *      
+ * @param usChecksum: Checksum value to be set.
+ */
 static void prvSetChecksumInPacket( struct xPacketSummary * pxSet,
                                     uint16_t usChecksum )
 {
@@ -160,6 +168,14 @@ static void prvSetChecksumInPacket( struct xPacketSummary * pxSet,
     }
 }
 
+/**
+ * @brief Get checksum from the packet summary
+ *  
+ * @param pxSet: Pointer to the packet summary that describes the packet,
+ *                  from which the checksum will be retrieved.
+ *      
+ * @return Checksum value that is retrieved from pxSet.
+ */
 static uint16_t prvGetChecksumFromPacket( const struct xPacketSummary * pxSet )
 {
     uint16_t usChecksum;