documentaion directives/scalars

**Is your feature request related to a problem? Please describe.**

In new version of graphql-modules there is no documentation for how to implement directives with graphql-modules, old version had it covered. With current documentation it is hard to understand what is the best practice for this case.
https://www.graphql-modules.com/docs/legacy/recipes/schema-directives

**Describe the solution you'd like**
I'd like to see what are the options for directives/scalars in documentation.