docs(gatsby-remark-images): Fix description of showCaptions (#16442)
docs(gatsby-remark-images): Fix description of showCaptions (#16442)

The `showCaptions` array option’s documentation was the wrong way around. [gatsby-remark-images]
gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby