Updated default (#13545)

* Updated default

* revised sentence

* removed hyphen

* Update docker-hub/builds/index.md

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>
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@ -302,16 +302,9 @@ You could also use capture groups to build and label images that come from vario
### Build images with BuildKit
You can enable the BuildKit builder by setting the `DOCKER_BUILDKIT=1`
[environment variable](#environment-variables-for-builds) in the
[Configure automated build settings](#configure-automated-build-settings) section.
Refer to the [build images with BuildKit](../../develop/develop-images/build_enhancements.md)
Autobuilds use the BuildKit build system by default. If you want to use the legacy Docker build system, add the [environment variable](index.md#environment-variables-for-builds){: target="_blank" rel="noopener" class="_"} `DOCKER_BUILDKIT=0`. Refer to the [build images with BuildKit](../../develop/develop-images/build_enhancements.md)
page for more information on BuildKit.
> **Note**
>
> Autobuilds use the buildKit build-system by default. If you want to use the legacy Docker build-system, add the [environment variable](index.md#environment-variables-for-builds){: target="_blank" rel="noopener" class="_"} DOCKER_BUILDKIT=0.
## Build repositories with linked private submodules
Docker Hub sets up a deploy key in your source code repository that allows it