Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

libsrc/serial/ser-kernel.s

@@ -103,8 +103,8 @@ copy:   lda     (ptr1),y
 ;----------------------------------------------------------------------------
 ; unsigned char ser_uninstall (void);
 ; /* Uninstall the currently loaded driver and return an error code.
-;  * Note: This call does not free allocated memory.
-;  */
+; ** Note: This call does not free allocated memory.
+; */
 
 _ser_uninstall:
         jsr     ser_uninstall           ; Call driver routine

libsrc/serial/ser_get.s

@@ -3,8 +3,8 @@
 ;
 ; unsigned char __fastcall__ ser_get (char* b);
 ; /* Get a character from the serial port. If no characters are available, the
-;  * function will return SER_ERR_NO_DATA, so this is not a fatal error.
-;  */
+; ** function will return SER_ERR_NO_DATA, so this is not a fatal error.
+; */
 
 
         .importzp       ptr1

libsrc/serial/ser_put.s

@@ -3,9 +3,9 @@
 ;
 ; unsigned char __fastcall__ ser_put (char b);
 ; /* Send a character via the serial port. There is a transmit buffer, but
-;  * transmitting is not done via interrupt. The function returns
-;  * SER_ERR_OVERFLOW if there is no space left in the transmit buffer.
-;  */
+; ** transmitting is not done via interrupt. The function returns
+; ** SER_ERR_OVERFLOW if there is no space left in the transmit buffer.
+; */
 
 
         .include        "ser-kernel.inc"