Improve rpc api return objects encoding

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

specs/openrpc.json

@@ -452,7 +452,7 @@
           "readers",
           "executors",
           "created_at",
-          "upddated_at"
+          "updated_at"
         ],
         "properties": {
           "id": {
@@ -484,10 +484,9 @@
             "type": "integer",
             "format": "int64"
           },
-          "upddated_at": {
+          "updated_at": {
             "type": "integer",
-            "format": "int64",
-            "description": "Typo retained intentionally"
+            "format": "int64"
           }
         }
       },
@@ -499,7 +498,7 @@
           "address",
           "topic",
           "local",
-          "crated_at",
+          "created_at",
           "updated_at"
         ],
         "properties": {
@@ -519,10 +518,9 @@
           "local": {
             "type": "boolean"
           },
-          "crated_at": {
+          "created_at": {
             "type": "integer",
-            "format": "int64",
-            "description": "Typo retained intentionally"
+            "format": "int64"
           },
           "updated_at": {
             "type": "integer",