feat: improve deprecation notices during development (#5185)
feat: improve deprecation notices during development (#5185)

This update tells developers the new name of the deprecated props to make it easier to upgrade.

re gatsbyjs/gatsby#3986
fk/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,fk/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,fk/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,0x80/gatsby,0x80/gatsby