Rollup merge of #104772 - GuillaumeGomez:small-accessibility-improvement, r=notriddle

Small accessibility improvements

From this [reddit post](https://www.reddit.com/r/rust/comments/z1gyz7/accessible_documentation/), I started to check a bit how to improve accessibility and how we could add test for it.

So these two fixes come from the use of the [pa11y tool](https://github.com/pa11y/pa11y). To make it work, I had to update its puppeteer version to the last one but otherwise it seems to be quite nice. I didn't fix all the errors it reported because they were about colors. To get the same result as mine, you can use this config:

```json
{
    "ignore": [
	"WCAG2AA.Principle1.Guideline1_4.1_4_3.G18.Fail",
	"WCAG2AA.Principle3.Guideline3_2.3_2_2.H32.2"
     ]
}
```

I think trying to improve accessibility is something we should definitely aim for. I'll try to integrate a tool to enforce this check (very likely `pa11y`) directly into the CI.

cc ``@jsha``
r? ``@notriddle``

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