Update coding-style.md with basic markdown syntax

This CL makes only styling changes.  Incorrect information persists.

BUG=b:26912592
TEST=None

Change-Id: I1d095f055a290757bea415b117969a5b86597bd9
Reviewed-on: https://chromium-review.googlesource.com/325401
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
1 file changed