add Transformations API link

Author: pwseg

src/api/public-api/fql.md

@@ -9,7 +9,7 @@ redirect_from:
 
 This reference provides a comprehensive overview of the Segment Destination Filter query language. For information on the Destination Filters API (including information on migrating from the Config API), visit the [Destination Filters API reference](https://docs.segmentapis.com/tag/Destination-Filters){:target="_blank"}.
 
-The Transformations API uses Filter Query Language (FQL) to filter JSON objects and conditionally apply transformations. You can use FQL statements to:
+The [Transformations API](https://docs.segmentapis.com/tag/Transformations/){:target="_blank"} uses Filter Query Language (FQL) to filter JSON objects and conditionally apply transformations. You can use FQL statements to:
 - Apply filters that evaluate to `true` or `false` based on the contents of each Segment event. If the statement evaluates to `true`, the transformation is applied, and if it is `false` the transformation is not applied.
 - [Define new properties based on the result of an FQL statement](/docs/protocols/transform/#use-cases).