Update UI copy based on reviewer feedback

ee/app/views/groups/settings/_allowed_email_domain.html.haml

@@ -4,11 +4,13 @@
 
 .form-group
   %label{ id: label_id }
-    = _('Restrict membership by email')
+    = _('Restrict membership by email domain')
   .js-allowed-email-domains{ data: { hidden_input_id: hidden_input_id, label_id: label_id } }
   = f.hidden_field :allowed_email_domains_list, id: hidden_input_id
   .form-text.text-muted
     - read_more_link = link_to(_('Read more'), help_page_path('user/group/index', anchor: 'allowed-domain-restriction-premium'))
     = _('Only verified users with an email address in any of these domains can be added to the group.')
     %br
+    = _('Multiple domains are supported.')
+    %br
     = _('Some common domains are not allowed. %{read_more_link}.').html_safe % { read_more_link: read_more_link }

locale/gitlab.pot

@@ -14799,6 +14799,9 @@ msgstr ""
 msgid "MrDeploymentActions|Stop environment"
 msgstr ""
 
+msgid "Multiple domains are supported."
+msgstr ""
+
 msgid "Multiple issue boards"
 msgstr ""
 
@@ -19478,7 +19481,7 @@ msgstr ""
 msgid "Restrict access by IP address"
 msgstr ""
 
-msgid "Restrict membership by email"
+msgid "Restrict membership by email domain"
 msgstr ""
 
 msgid "Restricts sign-ups for email addresses that match the given regex. See the %{supported_syntax_link_start}supported syntax%{supported_syntax_link_end} for more information."