Update container subschema examples to be valid

Author: chandanbn

schema/v5.0/docs/cnaContainer-advanced-example.json

@@ -1,5 +1,8 @@
 {
   "cnaContainer": {
+    "providerMetadata": {
+      "orgId": "00000000-0000-4000-9000-000000000000"
+    },
     "title": "Buffer overflow in Example Enterprise allows Privilege Escalation.",
     "datePublic": "2021-09-08T16:24:00.000Z",
     "problemTypes": [

schema/v5.0/docs/cnaContainer-basic-example.json

@@ -1,5 +1,8 @@
 {
   "cnaContainer": {
+    "providerMetadata": {
+      "orgId": "00000000-0000-4000-9000-000000000000"
+    },
     "problemTypes": [
       {
         "descriptions": [

schema/v5.0/docs/cnaContainer-rejected-example.json

@@ -0,0 +1,14 @@
+{
+  "cnaContainer": {
+    "providerMetadata": {
+      "orgId": "00000000-0000-4000-9000-000000000000",
+      "shortName": "example"
+    },
+    "rejectedReasons": [
+      {
+        "lang": "en",
+        "value": "This CVE ID has been rejected or withdrawn by its CVE Numbering Authority."
+      }
+    ]
+  }
+}