runtime: document the G states
In particular, write down the rules for stack ownership because the details of this are about to get very important with concurrent stack shrinking. (Interestingly, the details don't actually change, but anything that's currently skating on thin ice is likely to fall through.) Fox #12967. Change-Id: I561e2610e864295e9faba07717a934aabefcaab9 Reviewed-on: https://go-review.googlesource.com/20034Reviewed-by: Rick Hudson <rlh@golang.org>
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