Fixed SDK name

Author: dreamorosi

docs/core/tracer.md

@@ -3,7 +3,7 @@ title: Tracer
 description: Core utility
 ---
 
-Tracer is an opinionated thin wrapper for [AWS X-Ray Python SDK](https://github.com/aws/aws-xray-sdk-python/).
+Tracer is an opinionated thin wrapper for [AWS X-Ray SDK for Node.js](https://github.com/aws/aws-xray-sdk-node).
 
 ![Tracer showcase](../media/tracer_utility_showcase.png)