Correct grammar

Author: alexravenna

articles/ai-services/openai/concepts/models.md

@@ -254,7 +254,7 @@ The following Embeddings models are available with [Azure Government](/azure/azu
 
 ### Assistants (Preview)
 
-For Assistants you need a combination of a supported model, and a supported region. Certain tools and capabilities require the latest models. For example [parallel function](../how-to/assistant-functions.md) calling requires the latest 1106 models.
+For Assistants you need a combination of a supported model and a supported region. Certain tools and capabilities require the latest models. For example, [parallel function calling](../how-to/assistant-functions.md) requires the latest 1106 models.
 
 | Region | `gpt-35-turbo (0613)` | `gpt-35-turbo (1106)` | `gpt-4 (0613)` | `gpt-4 (1106)` | `gpt-4 (0125)` | 
 |-----|---|---|---|---|---|