Update FAQ about incongruent code & author remarks

As I was looking at 2004/burley/README.md it occurred to me that
numerous entries have been modified in ways that are incongruent with
what the author(s) originally wrote about the entry. In some cases this
has been noted in the README.md file (like has been added to
2004/burley/README.md itself) but not in all. That should probably be
checked for and I will do that in time most likely but in the meantime
it felt even better to update the FAQ about this which this commit does
as well.

2004/burley/README.md

@@ -70,6 +70,9 @@ the program so this "strategy" no longer works?
 Notice the clever use of `setjmp()` and `longjmp()` calls.  Can you keep track
 of what state is being saved and restored?
 
+NOTE: the author talks about how it is a single statement. This might not be
+strictly true in 2023 for the fixes for it to work so you can look at the
+original file [burley.orig.c](burley.orig.c) to see what is meant.
 
 ## Author's remarks: