docs: clarify async and callback plugin styles#297

MauricioMoraisZage wants to merge 1 commit into

fastify:mainfastify/fastify-plugin:mainfrom

MauricioMoraisZage:docs/clarify-async-callback-plugin-styleMauricioMoraisZage/fastify-plugin:docs/clarify-async-callback-plugin-styleCopy head branch name to clipboard