message: docs: update page routes and custom errors
diff: @@ -189,7 +189,7 @@ The default page routes follow the same convention as next `useFileSystemPublicR
  E.g.
  -| page | uri |
  +| page | path |
  | --------------------------- | ------------------- |
  | pages/index.js | / |
  | pages/post.js | /post |
  