build: fix intro of distributed build section (#22189)

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## Description

Oversight from https://github.com/docker/docs/pull/22126. We have a
single tag being pushed.

## Reviews

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- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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@ -109,13 +109,8 @@ each platform across multiple runners and create manifest list using the
The following workflow will build the image for each platform on a dedicated
runner using a matrix strategy and push by digest. Then, the `merge` job will
create manifest lists and push them to two registries:
- Docker Hub: `docker.io/docker-user/my-app`
- GitHub Container Registry: `ghcr.io/gh-user/my-app`
This example also uses the [`metadata` action](https://github.com/docker/metadata-action)
to set tags and labels.
create manifest lists and push them to Docker Hub. The [`metadata` action](https://github.com/docker/metadata-action)
is used to set tags and labels.
```yaml
name: ci