docs for the upcoming snapshot

[Benjamin Kosnik]

> 1)  Are we calling the snapshot 2.91 as suggested?  I like it.

yep. I put a test canidate up already.

> 2)  What's the fate of --enable-libgcc-rebuild?  We haven't needed it since
>     the merge, but it's still present-but-commented, and documented as such.
>     I'm all for ripping it out if we can't forsee any possible use for it
>     anymore, even with "funky ABI-breaking" flags.

please remove all traces of libgcc-rebuild. I thought I already did this.

> 3)  I don't suppose the mailing lists could be moved to @gcc.gnu.org in
>     the next 48 hours.  :-)

I think Gerald is responsible for that.

-benjamin