[luatex] stability disclaimer in the manual

[Taco Hoekwater]

Manuel Pégourié-Gonnard wrote:
> Hi,
> 
> I happened to re-read the disclaimer in the introduction of the LuaTeX manual
> (version from trunk) recently. At the end, it states that
> 
>> Currently we expect the first release with (some) fixed interfaces to be
>> available sometime in the autumn of 2008. [...]
> 
> Since 2008 is now in the past, you may want to update the wording :-)
> 
> Manuel.
> 
> PS: I'm not asking for more stability right now, nor for comprehensive
> stability-related indications in the manual, just pointing out a small typo.

Actually, some stuff (like the node and font interface) is now rather
stable, I'll try to add some remarks in the relevant sections.

Best wishes,
Taco