[Starlingx-discuss] document outdated

[wang guo]

https://docs.starlingx.io/developer_guide/index.html#setup-repository-docker-container

After executing "cd $HOME/stx-tools/centos-mirror-tools/", cannot find
Dockerfile at this directory; then execute "docker build --tag
$USER:centos-mirror-repository --file Dockerfile" failed.
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