EAV Attribute key for frontend_model is incorrect in documentation

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Which topic?

https://developer.adobe.com/commerce/php/development/components/attributes/#add-product-eav-attribute-options-reference

### What's wrong with the content?

https://developer.adobe.com/commerce/php/development/components/attributes/#add-product-eav-attribute-options-reference

On this page, the key for the EAV Attribute frontend_model is mentionned as "frontend".
The correct key is "frontend_model".

### What changes do you propose?

_No response_

### Anything else that can help to cover this?

_No response_

Open the linked Commerce PHP documentation page and go to the “Add product EAV attribute options reference” section. Verify the entry for the frontend_model attribute and update its key from “frontend” to “frontend_model”; it is done when the published reference shows the correct key.

Written by the indexing model from the issue text.