Update release related information (#101819)
Update release related information. Features became more complex. Number of commits per releases have increased a lot.
We had in average:
2.5k commits for releases 1.1.0-1.7.0,
3-3.5k commits for releases 1.8.0-1.12.0
4.5k-5k commits for releases 1.13.0, 2.0.0
Hence current target is 3 releases a year
Pull Request resolved: https://github.com/pytorch/pytorch/pull/101819
Approved by: https://github.com/svekars, https://github.com/malfet
