fix typo in example CSAF file

Author: individual-it

examples/example-csaf.json

@@ -25,7 +25,7 @@
             }
          },
          "id": "CSAF-Document-20221209155839",
-         "initial_relese_data": "2022-12-09T15-58-39Z",
+         "initial_release_date": "2022-12-09T15-58-39Z",
          "revision_history": [
             {
                "date": "2022-12-09T15-58-39Z",