add missing schema to "Path Item Object Example"

As pointed out by @darrelmiller, the path item object example was missing its `schema` attribute.

Author: ePaul

versions/3.0.md

@@ -713,9 +713,11 @@ This object can be extended with [Specification Extensions](#specificationExtens
       "in": "path",
       "description": "ID of pet to use",
       "required": true,
-      "type": "array",
-      "items": {
-        "type": "string"
+      "schema": {
+        "type": "array",
+        "items": {
+          "type": "string"
+        }
       },
       "style": "simple"
     }
@@ -748,10 +750,11 @@ parameters:
   in: path
   description: ID of pet to use
   required: true
-  type: array
-  style: simple
-  items:
-    type: string  
+  schema:
+    type: array
+    style: simple
+    items:
+      type: string  
 ```
 
 #### <a name="operationObject"></a>Operation Object