Use bullet list for task list

Author: kahgoh

exercises/intergalactic-transmission/instructions.md

@@ -1,6 +1,9 @@
 # Instructions
 
-Your job is to help implement the message sequencer, which calculates the transmission sequence, and the decoder for receiving messages.
+Your job is to help implement the following:
+
+- the message sequencer, which calculates the transmission sequence
+- the decoder, which decodes the messages
 
 A parity bit is simple way of detecting transmission errors.
 The transmitters and receivers can only transmit and receive _exactly_ eight bits at a time (including the parity bit).