fix links

Author: mrbullwinkle

articles/cognitive-services/openai/includes/dotnet.md

@@ -138,7 +138,7 @@ namespace azure_openai_quickstart
 ```
 
 > [!IMPORTANT]
-> For production, use a secure way of storing and accessing your credentials like [Azure Key Vault](../../../../key-vault/general/overview.md). For more information about credential security, see the Cognitive Services [security](../../../security-features.md) article.
+> For production, use a secure way of storing and accessing your credentials like [Azure Key Vault](../../../key-vault/general/overview.md). For more information about credential security, see the Cognitive Services [security](../../security-features.md) article.
 
 ```cmd
 dotnet run program.cs