Documentation is unclear where factory providers arguments are coming from

**Describe the bug**
In this doc https://github.com/Urigo/graphql-modules/blob/master/website/docs/di/providers.md#factory

The factory has a dependency `Config` which is used as a value, but then also used as a type in the argument of the factory. It's not clear what the value or the type is from the code examples. The prose explaining the code example do not explain what these values and types are.

**Expected behavior**

It should be clear what the values and types represent and where they are coming from.

**Environment:**

website