feat(Documentation/modules): note the dashboard is compiled in

Documentation/modules.md

@@ -5,7 +5,10 @@ These modules provide things like dashboards, locks and leader election.
 
 ### Dashboard
 
-An HTML dashboard can be found at `http://127.0.0.1:4001/mod/dashboard/`. Use the `-cors='*'` flag to allow your browser to request information from the current master as it changes.
+An HTML dashboard can be found at `http://127.0.0.1:4001/mod/dashboard/`.
+This dashboard is compiled into the etcd binary and uses the same API as regular etcd clients.
+
+Use the `-cors='*'` flag to allow your browser to request information from the current master as it changes.
 
 ### Lock