Correcting typo in healthmonitors-list-response.json - http_vesion to http_version.

There is a typographical error in healthmonitors-list-response.json.
Correcting spelling from http_vesion to http_version.

Task: 36020
Story: 2006304
Change-Id: I6be0a593b1deb43f8aba982043ebf427be57d937

api-ref/source/v2/examples/healthmonitors-list-response.json

@@ -23,7 +23,7 @@
             "id": "8ed3c5ac-6efa-420c-bedb-99ba14e58db5",
             "operating_status": "ONLINE",
             "tags": ["test_tag"],
-            "http_vesion": 1.0,
+            "http_version": 1.0,
             "domain_name": null
         }
     ]