[EDU-2124] - Fix untilAttach examples to contain subscribe

[GregHolmes]

Description

There was an issue raised in Slack where in the continuous history docs under "History with untilAttach" the user would never receive messages after attach as there was no subscribe. This PR adds subscribe to show this functionality.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch EDU-2124-Fix-incorrect-code-snippet-for-History-with-untilAttach

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