class11: add doc link

classes/class11/meta.json

@@ -2,6 +2,6 @@
     "name": "Class 11 - C&C detection",
     "id": "class-11",
     "description": "The eleventh class focuses on manual and automatic detection of C&C channels. <br>Please open the Google document provided to all registered students and follow the document. <br><ul><li>After starting the class, connect to your lab with '<b>ssh [email protected]</b>' and 'admin' password</li></ul>",
-    "google_doc_url": "",
+    "google_doc_url": "https://docs.google.com/document/d/1RnfbiDkNp-zHXzTZAv_PoTSHbpDmqGhtYLKxhDaCUns/edit?usp=sharing",
     "yt_recording_url": ""
 }