Add release section for milestones and rel notes


Docs-Preview: https://skia.org/?cl=240246
Bug: skia:
Change-Id: If6fb0cd3a8c7f9d423cf2ee366038790b919acd7

TBR=jcgregorio

No-Try: true

Change-Id: If6fb0cd3a8c7f9d423cf2ee366038790b919acd7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240246
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Heather Miller <hcm@google.com>
Auto-Submit: Heather Miller <hcm@google.com>
4 files changed