fixed API example of the update device group pointing to the wrong endpoint

Naor Livne · Naor Livne · commit b692e5ad6d05 · 2019-01-15T10:43:18.000+02:00
diff --git a/docs/api.md b/docs/api.md
@@ -695,7 +695,7 @@ update a device group
  **request**
 
 ```
-POST /api/v2/device_groups/device_group_name HTTP/1.1
+POST /api/v2/device_groups/device_group_name/update HTTP/1.1
 Host: localhost:5000
 Authorization: Basic <your-token-here>
 Content-Type: application/json
