OBSDOCS-1328 - Add SMTP behavior in the docs

[eromanova97]

Version(s): 4.12 +

Issue: https://issues.redhat.com/browse/OBSDOCS-1328

Link to docs preview: https://103258--ocpdocs-pr.netlify.app/openshift-monitoring/latest/configuring-core-platform-monitoring/configuring-alerts-and-notifications.html#configuring-alert-routing-default-platform-alerts_configuring-alerts-and-notifications

QE review:

• [x] QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Wed Dec 10 13:01:52 - Prow CI generated the docs preview:

https://103258--ocpdocs-pr.netlify.app/openshift-monitoring/latest/configuring-core-platform-monitoring/configuring-alerts-and-notifications.html

[openshift-ci[bot]]

@eromanova97: all tests passed!

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[juzhao]

/lgtm

[eromanova97]

/cherrypick monitoring-docs-4.21

[openshift-cherrypick-robot]

@eromanova97: new pull request created: #104235

In response to this:

/cherrypick monitoring-docs-4.21

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.