DO NOT MERGE - release notes for 1.2 - #378

[Linkspector] reported by reviewdog 🐶 Cannot reach https://learn.openapis.org/upgrading/overlay-v1.1-to-v1.2.html Status: 404 Raw Output: message:"Cannot reach https://learn.openapis.org/upgrading/overlay-v1.1-to-v1.2.html Status: 404" location:{path:"releases/v1.2.md" range:{start:{line:8 column:25} end:{line:8 column:112}}} severity:ERROR source:{name:"linkspector" url:"https://github.com/UmbrellaDocs/linkspector"}