Update standalone.md

[vchan-in]

Proposed changes

Added:

1. sudo to the existing command curl -SL https://github.com/.... For Linux users who don't always logging as root user by default.
2. chmod +x /usr/local/bin/docker-compose as an additional tip for users after installation. As docker-compose executable will not have the executable permissions by default.

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[docker-robot[bot]]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

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