Headings are read twice by VoiceOver

### Have you read the Contributing Guidelines on issues?

- [X] I have read the [Contributing Guidelines on issues](https://github.com/facebook/docusaurus/blob/main/CONTRIBUTING.md#issues).

### Prerequisites

- [X] I'm using the latest version of Docusaurus.
- [ ] I have tried the `npm run clear` or `yarn clear` command.
- [ ] I have tried `rm -rf node_modules yarn.lock package-lock.json` and re-installing packages.
- [ ] I have tried creating a repro with https://new.docusaurus.io.
- [ ] I have read the console error message carefully (if applicable).

### Description

On macOS, the VoiceOver screen reader reads all headings twice, which is very annoying.

Here's a recording using Safari + VoiceOver:

https://github.com/facebook/docusaurus/assets/69485/062a9caa-ea9f-4fca-943e-bace83c92015

And here's a recording using Chrome + VoiceOver:

https://github.com/facebook/docusaurus/assets/69485/881a38bc-89a4-42e6-b374-0d589c6b5004

### Reproducible demo

_No response_

### Steps to reproduce

1. Go to https://docusaurus.io/docs
2. Activate VoiceOver with `Cmd + F5`
3. Press ` + A` (usually Ctrl + Alt + A)

### Expected behavior

I'd expect each heading to only be read once.

### Actual behavior

Each heading is read twice.

### Your environment

Official Docusaurus website.

### Self-service

- [ ] I'd be willing to fix this bug myself.