Update call-api.md

Author: BaherAbdullah

articles/cognitive-services/language-service/custom-named-entity-recognition/how-to/call-api.md

@@ -163,7 +163,7 @@ First you will need to get your resource key and endpoint
 
 4. After you've installed the client library, use the following samples on GitHub to start calling the API.
 
-    * [C#](https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/textanalytics/Azure.AI.TextAnalytics/tests/samples/Sample9_RecognizeCustomEntitiesConvenience.cs)
+    * [C#](https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/textanalytics/Azure.AI.TextAnalytics/samples/Sample9_RecognizeCustomEntities.md)
     * [Java](https://github.com/Azure/azure-sdk-for-java/blob/main/sdk/textanalytics/azure-ai-textanalytics/src/samples/java/com/azure/ai/textanalytics/lro/RecognizeCustomEntities.java)
     * [JavaScript](https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/textanalytics/ai-text-analytics/samples/v5/javascript/customText.js)
     * [Python](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/textanalytics/azure-ai-textanalytics/samples/sample_recognize_custom_entities.py)