Fixed typo: transacftion, now: transaction

**N** does not render as bold in the code text, so replace with easier read IDNUMBER.
Fix incorrect >**N** in some URLs.

(They don't show up as sub-lists unless you use 4)

https://wiki.civicrm.org/confluence/display/CRMDOC/Extending+Smarty

https://wiki.civicrm.org/confluence/display/CRMDOC/Backbone+Reference

https://wiki.civicrm.org/confluence/display/CRMDOC/Transaction+Reference

Why? Because right now there's where lots of other content exists which
is pretty similar to this page. And there's no "reference" chapter. I
think that once we're finished with the wiki migration we might like to
clean up that "framework" chapter a bit by moving some pages around. But
until then, I think it's easiest if we keep content together which is
similar.