update comments in config file

assets/sunshine.conf

@@ -49,6 +49,8 @@ ping_timeout = 2000
 # How much error correcting packets must be send for every video
 # This is just some random number, don't know the optimal value
 # The higher fec_percentage, the lower space for the actual data to send per frame there is
+#
+# The value must be greater than 0 and lower than or equal to 100
 fec_percentage = 10