[chore] [editorial] Switch registry docs to pre-processed frontmatter#3671

thompson-tomo wants to merge 4 commits into

open-telemetry:mainopen-telemetry/semantic-conventions:mainfrom

thompson-tomo:editoral/#1821_registryFrontMatterthompson-tomo/semantic-conventions:editoral/#1821_registryFrontMatterCopy head branch name to clipboard