Documentation for `singleSource` does not reflect code

[cyclimse]

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What did you do?

Documentation in README for singleSource is inaccurate, the default behavior preserves containers not defined in serverless.yml.

What did you expect to see?

Accurate documentation

What did you see instead?

Misleading documentation

What version of Node are you using (node --version)?

$ node --version

N/A

Does this issue reproduce with the latest release?

Yes