Docs: Update notifications.md (#26624)

docs/sources/alerting/notifications.md

@@ -76,12 +76,14 @@ VictorOps | `victorops` | yes, external only | no
 
 ### Email
 
-To enable email notifications you have to setup [SMTP settings]({{< relref "../administration/configuration/#smtp" >}})
+To enable email notifications you have to set up [SMTP settings]({{< relref "../administration/configuration/#smtp" >}})
 in the Grafana config. Email notifications will upload an image of the alert graph to an
 external image destination if available or fallback to attaching the image to the email.
 Be aware that if you use the `local` image storage email servers and clients might not be
 able to access the image.
 
+> **Note:** Template variables are not supported in email alerts.
+
 Setting | Description
 ---------- | -----------
 Single email | Send a single email to all recipients. Disabled per default.