[Model] 4.5.6 <alias> Element

- I think this section would benefit from an example right at this
point. It also makes it consistent since the other 4.5.x sections mostly
have  examples.

- The text may be a little confusing. 
Lets say i have an LFBx which uses an alias ifindex. Say the real
location (target) is in some portLFB:instanceI:a.b.c.d and the value at
that location is 0x12. Then: 
On LFBx (given i have write permission)
i) I can change the target to be new path say portLFB:instanceJ:a.b.c.e 
ii)I can SET the value of a.b.c.e (if i have write permissions)

It almost seems to me you should never have the need for #ii (we have
been using aliases and have had no need to so far) and that you should
occasionally need to to do #i (for reasons i wont go into we  do it more
than occasionally).

The text talks about #ii but not about #i.

cheers,
jamal