temporarily mark survival models as internal

[topepo]

Until censored is fully operational

[hfrick]

We soft-deprecated surv_reg(), i.e. it now gives a warning and tells you to use survival_reg(), the help file including examples points to the new function, and the help file itself is now also internal. So I'd say we either undo all of that or we don't make survival_reg() internal.

Are we also adapting the news file?

[juliasilge]

I do think we should take this out of the NEWS file and put it back in after it goes to CRAN, for the next release.

[topepo]

I've update the news file in the RC branch.

I think the message is ok. It's not removed, just not listed (easily) in the help.

[hfrick]

okay sure, it just means that in this branch neither surv_reg() nor survival_reg() are listed in the documentation index. if you think that's fine then I have no more comments on this one 👍

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