Docs feedback: Move the Reply by email page to the Use GitLab section

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Summary

Gitlab SaaS Notification email should not contains text `Reply to this email directly`, because it is disabled on Gitlab SaaS

https://docs.gitlab.com/ee/administration/reply_by_email.html

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Steps to reproduce

receive any issue or mr comment notification email

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Possible fixes

Edited by 🤖 GitLab Bot 🤖