Typo fix, correct heading style

Author: denrea

learn-pr/wwl-data-ai/develop-generative-ai-vision-apps/includes/3-develop-visual-chat-app.md

@@ -4,7 +4,7 @@ The key difference is that prompts for a vision-based chat include multi-part us
 
 ![Diagram of a multi-part prompt being submitted to a model.](../media/multi-part-prompt.png)
 
-## Submitting an image-based prompt using the *Responses* API
+## Submit an image-based prompt using the *Responses* API
 
 To include an image in a prompt using the *Responses* API, specify a URL for a web-based image file, or load a local image and encode its data in Base64 format and submit a URL in the format  `data:image/jpeg;base64,{image_data}` (replacing "jpeg" with "png" pr other formats as appropriate).
 
@@ -33,9 +33,9 @@ response = client.responses.create(
 print(response.output_text)
 ```
 
-## Submitting an image-based prompt using the *ChatCompletions* API
+## Submit an image-based prompt using the *ChatCompletions* API
 
-When using the Azure OpenAI endpoint to submit prompts to models that don;t support the *Responses* API, you can use the *CatCompletions* API; like this:
+When using the Azure OpenAI endpoint to submit prompts to models that don't support the *Responses* API, you can use the *CatCompletions* API; like this:
 
 ```python
 # Read the image data from a local file