[SPEC] Fixed bad JSON in indices.open

Author: clintongormley

rest-api-spec/api/indices.open.json

@@ -4,7 +4,7 @@
     "methods": ["POST"],
     "url": {
       "path": "/{index}/_open",
-      "paths": ["_open", /{index}/_open"],
+      "paths": ["_open", "/{index}/_open"],
       "parts": {
         "index": {
           "type" : "string",