updated docs for reporting (#23733)

* updated docs

* peering comments

* Added info about what version test mails requires

docs/sources/enterprise/reporting.md

@@ -42,6 +42,19 @@ Currently only Organization Admins can create reports.
 
 {{< docs-imagebox img="/img/docs/enterprise/reports_create_new.png" max-width="500px" class="docs-image--no-shadow" >}}
 
+## Send test mail
+
+> Only available in Grafana Enterprise v7.0+.
+
+1. In the report, click **Send test mail**.
+1. In the Email field, enter the email address or addresses that you want to test, separated by semicolon.
+If you want to use email addresses from the report, then select the **Use emails from report** check box.
+1. Click **Send**.
+
+The last saved version of the report will be sent to selected emails. You can use this to verify emails are working and to make sure the report generates and is displayed as you expect.
+
+{{< docs-imagebox img="/img/docs/enterprise/reports_send_test_mail.png" max-width="500px" class="docs-image--no-shadow" >}}
+
 ## Rendering configuration
 
 When Grafana generates a report, it will render each panel separately and then put them together in a PDF file. You can configure the per-panel rendering request timeout and the maximum number of concurrent calls to the rendering service. These options are available in the [configuration]({{< relref "../installation/configuration.md">}}) file.