Update using-x-ray.md

Corrected service name from "XRay" to "X-Ray"

Author: dulac

doc_source/using-x-ray.md

@@ -36,4 +36,4 @@ From the service map, you can zoom in to see a trace view of your Lambda functio
   + **Custom subsegments** – Custom subsegments or user annotations that you can add to the Lambda function segment by using the X\-Ray SDK\. 
 
 **Note**  
-For each traced invocation, Lambda emits the Lambda service segment and all of its subsegments\. These segments are emitted regardless of the runtime and require you to use the XRay SDK for AWS API calls\. 
+For each traced invocation, Lambda emits the Lambda service segment and all of its subsegments\. These segments are emitted regardless of the runtime and require you to use the X\-Ray SDK for AWS API calls\.