Clean up glibc version numbers in manual

[Roland McGrath]

> Besides, the free software community is not governed by so called
> "work days" and whatnot.  People tend to work on these projects
> whenever they feel like it.  So I think your complaint is a bit off
> the mark, and ultimately unreasonable.

Sorry, you're just wrong.  It is entirely reasonable to expect that I be
consulted on core issues of glibc maintenance.  It is also entirely
reasonable that my personal realities (including illness, working only at
certain times, and being American) sometimes involve periods of a few days
during which I don't respond to glibc issues.  There was no urgency in
making any of these changes, and so no excuse for cutting short the usual
collaborative process.