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Update hub auto build doc 

Hub backend dose not support `Create multiple Docker tags from a single build`. Take it off from the docs. Already received several issues asking about why it is not working according to the doc.
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Ming He 2019-01-24 19:11:21 -08:00 committed by GitHub
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docker-hub/builds/index.md
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@ -292,25 +292,6 @@ You could also use capture groups to build and label images that come from vario
`/(alice|bob)-v([0-9.]+)/` -->
### Create multiple Docker tags from a single build
By default, each build rule builds a source branch or tag into a Docker image,
and then tags that image with a single tag. However, you can also create several
tagged Docker images from a single build rule.
To create multiple tags from a single build rule, enter a comma-separated list
of tags in the **Docker tag** field in the build rule. If an image with that tag
already exists, Docker Hub overwrites the image when the build completes
successfully. If you have automated tests configured, the build must pass these
tests as well before the image is overwritten. You can use both regex references
and plain text values in this field simultaneously.
For example if you want to update the image tagged with `latest` at the same
time as you a tag an image for a specific version, you could enter
`{sourceref},latest` in the Docker Tag field.
If you need to update a tag _in another repository_, use [a post_build hook](advanced.md#push-to-multiple-repos) to push to a second repository.
## Build repositories with linked private submodules
Docker Hub sets up a deploy key in your source code repository that allows it