Update gpt4v.md (Typo "Azure Open AI models"→"Azure OpenAI models") (#1435)

https://github.com/azure-samples/azure-search-openai-demo/blob/main/docs/gpt4v.md
#PingMSFTDocs

Author: hyoshioka0128

docs/gpt4v.md

@@ -21,7 +21,7 @@ This repository now includes an example of integrating GPT-4 Turbo with Vision w
    |`gpt-4`|`vision-preview`|
 
 - Ensure that you can deploy the Azure OpenAI resource group in [a region where all required components are available](https://learn.microsoft.com/azure/cognitive-services/openai/concepts/models#model-summary-table-and-region-availability):
-    - Azure Open AI models
+    - Azure OpenAI models
         - gpt-35-turbo
         - text-embedding-ada-002
         - gpt-4v