Bad copy for `alt` question

> What other techniques are part of your regular accessibility strategy?
>
> Descriptive `alt` text
>
> Providing alt text that describes the purpose or content of an image.

This is not what alt text is for. Alt text is for a textual *alternative* to the image, not a description of it. There is discussion of this in [HTML5 § 4.8.4.4 Requirements for providing text to act as an alternative for images](https://html.spec.whatwg.org/multipage/images.html#alt).

Suggestion:

> What other techniques are part of your regular accessibility strategy?
>
> `alt` text
>
> Providing text alternatives for images.

Find the survey's YAML configuration containing the quoted accessibility question and review the current wording. Replace the description with the suggested wording about text alternatives for images, then verify the survey configuration remains valid.

Written by the indexing model from the issue text.