Update functions-bindings-openai.md (Typo "Azure OpenAI service"→"Azure OpenAI Service")

https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/azure-functions/functions-bindings-openai.md
#PingMSFTDocs

Author: hyoshioka0128

articles/azure-functions/functions-bindings-openai.md

@@ -18,7 +18,7 @@ zone_pivot_groups: programming-languages-set-functions
 
 [!INCLUDE [preview-support](../../includes/functions-openai-support-limitations.md)]
 
-The Azure OpenAI extension for Azure Functions implements a set of triggers and bindings that enable you to easily integrate features and behaviors of the [Azure OpenAI service](../ai-services/openai/overview.md) into your function code executions. 
+The Azure OpenAI extension for Azure Functions implements a set of triggers and bindings that enable you to easily integrate features and behaviors of the [Azure OpenAI Service](../ai-services/openai/overview.md) into your function code executions. 
 
 Azure Functions is an event-driven compute service that provides a set of [triggers and bindings](./functions-triggers-bindings.md) to easily connect with other Azure services.