pruned extraneous comment

serial.c

@@ -24,10 +24,7 @@
 #include <avr/interrupt.h>
 #include <avr/sleep.h>
 
-// Define constants and variables for buffering incoming serial data.  We're
-// using a ring buffer (I think), in which rx_buffer_head is the index of the
-// location to which to write the next incoming character and rx_buffer_tail
-// is the index of the location from which to read.
+
 #ifdef __AVR_ATmega328P__
 #define RX_BUFFER_SIZE 256
 #else