[DOCS] Remove extraneous comma in Enrich Stats API's JSON response (#48539)

docs/reference/ingest/apis/enrich/enrich-stats.asciidoc

@@ -115,7 +115,7 @@ The API returns the following response:
                 "headers" : {
                     "X-Opaque-Id" : "123456" 
                 }
-            },
+            }
         }
     ],
     "coordinator_stats": [