[SDK-5171] Push subscription when clicking a notification from Terminated state

[hokstuff]

Summary

Adds some notes around a specific use case where a client wants to subscribe to push notifications and have that be triggered upon a Push click from Terminated state.

Related PRs, issues, or features (optional)

• N/A

Feature release date (optional)

• No release, can be merged whenever

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[jerielng]

Swift section LGTM

[hokstuff]

@internetisaiah This is ready for review by the Docs team for formatting. The content has been approved by the SDKs team