message: Add more to reference introduction
diff: @@ -9,3 +9,10 @@ keywords:
  ---
  Reference-level documentation for the Pikelet programming language.
  +
  +This is useful if you want a more in-depth look at each of the language features on their own.
  +
  +:::note
  +This is _not_ a precise description of the Pikelet language.
  +Implementors should therefore look to the [specification](./specification) to get a better understanding of how an implementation should behave.
  +:::
  