[PATCH 2.45] gas/doc: Update AArch64 Architecture Extensions

[Nick Clifton]

Hi Alice,

> Add faminmax, move a couple of misplaced entries, and improve a few
> other entries.
> 
> The documentation now lists every recognised extension name, with the
> exception of a couple of aliases that are deliberately undocumented.
> 
> ---
> 
> I'll push this to master.  Nick, is this ok for the branch as well?

Yes, please go ahead.

Cheers
   Nick