Remove unstable_ prefix from Suspense

[sebmarkbage]

We are using it with lazy and the combination Suspense + lazy seems pretty stable. maxDuration is not but that's only enabled when you're in ConcurrentMode which is still unstable.

Don't forget to fix www.

[sebmarkbage]

Although I guess #13921 is a counter argument. :)

[gaearon]

Would be nice to follow up to understand how it landed while breaking that test.

[sophiebits]

Should maxDuration be prefixed?

[sebmarkbage]

I think it's fine to leave maxDuration. You have to type unstable_ somewhere to use it. We're going to have to add types for this API and changing that after the fact, especially with the poor versioning story there, it'll be a pain.

[sizebot]

Details of bundled changes.

Comparing: 04c4f2f...7d66f90

scheduler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
scheduler.development.js	n/a	n/a	0 B	19.17 KB	0 B	5.74 KB	UMD_DEV
scheduler.production.min.js	n/a	n/a	0 B	3.16 KB	0 B	1.53 KB	UMD_PROD

Generated by 🚫 dangerJS