Fixes Azure gpt-35-turbo model not recognized 
diff --git a/llama_index/llms/openai_utils.py b/llama_index/llms/openai_utils.py
index 0ea20871c9826..2dd17a04240e8 100644
--- a/llama_index/llms/openai_utils.py
+++ b/llama_index/llms/openai_utils.py
@@ -69,6 +69,7 @@
     **TURBO_MODELS,
     **GPT3_5_MODELS,
     **GPT3_MODELS,
+    **AZURE_TURBO_MODELS,
 }
 
 CHAT_MODELS = {

# Description

Fixes problem where the Azure OpenAI models are not recognized when building VectorStoreIndex.  Added AZURE_TURBO_MODELS definition to ALL_AVAILABLE_MODELS

Fixes # (issue)

## Type of Change

Please delete options that are not relevant.

- [x] Bug fix (non-breaking change which fixes an issue)

# How Has This Been Tested?

Ran example from https://gpt-index.readthedocs.io/en/latest/examples/customization/llms/AzureOpenAI.html

# Suggested Checklist:

- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings
