Clean up and reformat the release notes for v1alpha8#401

tiyash-basu-frequenz merged 1 commit intofrequenz-floss:v0.x.xfrequenz-floss/frequenz-api-common:v0.x.xfrom

tiyash-basu-frequenz:revamp_release_notestiyash-basu-frequenz/frequenz-api-common:revamp_release_notesCopy head branch name to clipboard