message: docs: add customHandler to all plugin config options
diff: @@ -326,6 +326,7 @@ module.exports = page => {
  | assetsBucketName | \<empty\> | Creates an S3 bucket with the name provided. The bucket will be used for uploading next static assets. |
  | staticDir | \<empty\> | Directory with static assets to be uploaded to S3, typically a directory named `static`, but it can be any other name. Requires a bucket provided via the `assetPrefix` described above or the `assetsBucketName` plugin config. |
  | routes | [] | Array of custom routes for the next pages or static assets. |
  +| customHandler | \<empty\> | Path to your own lambda handler. |
  | uploadBuildAssets | true | In the unlikely event that you only want to upload the `staticDir`, set this to `false`. |
  ## Examples
  