Merge branch 'hchouraria-docs-service-desk-internal-email-role' into 'master'

Correct role required to view email address

See merge request gitlab-org/gitlab!54129

doc/user/project/service_desk.md

@@ -86,9 +86,10 @@ To improve your project's security, we recommend the following:
 - [Enable Akismet](../../integration/akismet.md) on your GitLab instance to add spam checking to this service.
   Unblocked email spam can result in many spam issues being created.
 
-The unique internal email address is visible to all project members in your GitLab instance. 
-However, when using an email alias externally, an end user (issue creator) cannot see the internal
-email address displayed in the information note.
+The unique internal email address is visible to project members with Maintainer (or higher)
+[permission level](../permissions.md)
+in your GitLab instance. However, when using an email alias externally, an end user
+(issue creator) cannot see the internal email address displayed in the information note.
 
 ### Using customized email templates