[v3] Tweak docs after 31717

[Gerald Pfeifer]

On Sat, 9 Jun 2007, Paolo Carlini wrote:
> committed mainline and 4_2-branch.

+      Note that those sanity checks are also perfomed when an explicit
+      --enable-clocale=gnu configure option is used:  this behavior is
+      new in gcc 4.2.1 and defends against misconfigurations.

Would you mind making this GCC 4.2.1 (instead of gcc 4.2.1), here and
possibly related places?

Thanks,
Gerald