update coding.md to reflect changes by pull
update coding.md to reflect changes by pull

- also mention alphabetical include ordering

(cherry picked from commit 86fe1b864b109869659f140af07047163637a673)

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin