remove csharp in Credentials utilities

Author: Xueran Zhang (Beyondsoft)

articles/synapse-analytics/spark/microsoft-spark-utilities.md

@@ -857,13 +857,6 @@ mssparkutils.credentials.help()
 
 ::: zone-end
 
-:::zone pivot = "programming-language-csharp"
-
-```csharp
-Credentials.Help()
-```
-
-::: zone-end
 
 :::zone pivot = "programming-language-r"
 
@@ -888,6 +881,10 @@ putSecret(akvName, secretName, secretValue): puts AKV secret for a given akvName
 putSecretWithLS(linkedService, secretName, secretValue): puts AKV secret for a given linked service, secretName
 ```
 
+> [!NOTE]
+> It is not supported in Csharp language.
+
+
 ### Get token
 
 Returns Azure AD token for a given audience, name (optional). The table below list all the available audience types: