Merge branch 'docs/ssot_admin_area_email' into 'master'

Edit email settings for SSOT

See merge request gitlab-org/gitlab-ce!28629

doc/user/admin_area/settings/email.md

+---
+type: reference
+---
+
 # Email
 
+You can customize some of the content in emails sent from your GitLab instance.
+
 ## Custom logo
 
 The logo in the header of some emails can be customized, see the [logo customization section](../../../customization/branded_page_and_email_header.md).
 
 ## Custom additional text **[PREMIUM ONLY]**
 
->[Introduced][ee-5031] in [GitLab Premium][eep] 10.7.
+> [Introduced][ee-5031] in [GitLab Premium][eep] 10.7.
 
 The additional text will appear at the bottom of any email and can be used for
 legal/auditing/compliance reasons.
@@ -24,8 +30,8 @@ legal/auditing/compliance reasons.
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22560) in GitLab 11.5.
 
-This configuration option sets the email hostname for [private commit emails](../../profile/index.md#private-commit-email),
-and it's, by default, set to `users.noreply.YOUR_CONFIGURED_HOSTNAME`.
+This configuration option sets the email hostname for [private commit emails](../../profile/index.md#private-commit-email).
+ By default it is set to `users.noreply.YOUR_CONFIGURED_HOSTNAME`.
 
 In order to change this option:
 
@@ -36,3 +42,15 @@ In order to change this option:
 NOTE: **Note**: Once the hostname gets configured, every private commit email using the previous hostname, will not get
 recognized by GitLab. This can directly conflict with certain [Push rules](https://docs.gitlab.com/ee/push_rules/push_rules.html) such as
 `Check whether author is a GitLab user` and `Check whether committer is the current authenticated user`.
+
+<!-- ## Troubleshooting
+
+Include any troubleshooting steps that you can foresee. If you know beforehand what issues
+one might have when setting this up, or when something is changed, or on upgrading, it's
+important to describe those, too. Think of things that may go wrong and include them here.
+This is important to minimize requests for support, and to avoid doc comments with
+questions that you know someone might ask.
+
+Each scenario can be a third-level heading, e.g. `### Getting error message X`.
+If you have none to add when creating a doc, leave this section in place
+but commented out to help encourage others to add to it in the future. -->
\ No newline at end of file