Update configuration docs for TypeScript

Author: novemberborn

docs/06-configuration.md

@@ -63,7 +63,7 @@ Note that providing files on the CLI overrides the `files` option.
 
 When using AVA 3, provide the `babel` option (and install [`@ava/babel`](https://github.com/avajs/babel) as an additional dependency) to enable Babel compilation.
 
-Provide the `typescript` option (and install [`@ava/typescript`](https://github.com/avajs/typescript) as an additional dependency) to enable (rudimentary) TypeScript support.
+Provide the `typescript` option (and install [`@ava/typescript`](https://github.com/avajs/typescript) as an additional dependency) for AVA to run tests written in TypeScript.
 
 ## Using `ava.config.*` files