re-mark the never docs as unstable #54207
Merged
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Fixes #54198
This stability attribute was removed in #47630, but not replaced with a
#[stable]
attribute, and when #50121 reverted that stabilization, it didn't set the docs back to unstable. I'm concerned as to why it was allowed to not have the stability attribute at all, but at least this can put it back.I'm nominating this for beta backport because it's a really small change, and right now our docs are in an awkward position where the
!
type is technically unstable to use, but the docs don't say so the same way any other library feature would. (And this is also the case on stable now, but i'm not suggesting a stable backport for a docs fix.)