[RFC] Update Stage 4 description

[Richard Biener]

On Wed, 9 Jan 2019, Tom de Vries wrote:

> [ To revisit https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00385.html ]
> 
> The current formulation for the description of Stage 4 here (
> https://gcc.gnu.org/develop.html ) is:
> ...
> During this period, the only (non-documentation) changes that may be
> made are changes that fix regressions.
> 
> Other changes may not be done during this period.
> 
> Note that the same constraints apply to release branches.
> 
> This period lasts until stage 1 opens for the next release.
> ...
> 
> This updated formulation was proposed by Richi (with a request for
> review of wording):
> ...
>  During this period, the only (non-documentation) changes that may
>  be made are changes that fix regressions.
> 
> -Other changes may not be done during this period.
> +Other important bugs like wrong-code, rejects-valid or build issues may
> +be fixed as well.  All changes during this period should be done with
> +extra care on not introducing new regressions - fixing bugs at all cost
> +is not wanted.
> 
>  Note that the same constraints apply to release branches.
> 
>  This period lasts until stage 1 opens for the next release.
> ...
> 
> If a text can be agreed upon, then I can prepare a patch for wwwdocs.

The proposed text sounds good, please post a patch and apply!

Thanks,
Richard.