Fix typo in configuring-email-for-notifications.md

[shati-patel]

Why:

There's a typo ("incom") and unnecessary newline in this article.

What's being changed:

Staging	Source	Notes
Configuring email for notifications	Source	Remove typo and newline

Check off the following:

• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[janiceilene]

This looks great @shati-patel!

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours.