Merge pull request OAI#1119 from MikeRalphson/patch-21

Correct discriminator json example

Author: fehguy

versions/3.0.md

@@ -2915,7 +2915,9 @@ components:
     "schemas": {
       "Pet": {
         "type": "object",
-        "discriminator": "petType",
+        "discriminator": {
+	  "propertyName": "petType"
+	},
         "properties": {
           "name": {
             "type": "string"