Docs: Update provisioning.md (grafana#21303)

floodcode · oddlittlebird · commit 48a93a5bd373 · 2019-12-31T07:32:05.000-08:00
diff --git a/docs/sources/administration/provisioning.md b/docs/sources/administration/provisioning.md
@@ -437,6 +437,7 @@ The following sections detail the supported settings for each alert notification
 | ---- |
 | bottoken |
 | chatid |
+| uploadImage |
 
 #### Alert notification `threema`
 
