Include tag property example for advanced record example

Adding an example of using a tag at the container level. Implements suggestion in Issue #277

Author: ccoffin

schema/docs/full-record-advanced-example.json

@@ -341,6 +341,9 @@
         "advisory": "ESA-22-11",
         "discovery": "EXTERNAL"
       },
+      "tags": [
+        "unsupported-when-assigned"
+      ],
       "taxonomyMappings": [
         {
           "taxonomyName": "ATT&CK",