[OpenID-Specs-eKYC-IDA] Issue #1303: Fix example document_UKTDIF.json (openid/ekyc-ida)

[Kosuke Koiwai]

New issue 1303: Fix example document_UKTDIF.json
https://bitbucket.org/openid/ekyc-ida/issues/1303/fix-example-document_uktdifjson

Kosuke Koiwai:

`policy` and `procedure` should be under `assurance_process` .

[https://openid.bitbucket.io/ekyc/openid-connect-4-identity-assurance.html#section-8.2-2](https://openid.bitbucket.io/ekyc/openid-connect-4-identity-assurance.html#section-8.2-2)

\(examples/response/document\_UKTDIF.json\)

> Same document under a different `trust_framework`

```
{
  "verified_claims": {
    "verification": {
      "trust_framework": "uk_tfida",
      "assurance_level": "medium",
      "policy": "gpg45",
      "procedure": "m1c",
      "assurance_process": {
        "assurance_details": [
          {
            "assurance_type": "evidence_validation",
            "assurance_classification": "score_3",
            "evidence_ref": [
              {
                "txn": "DL1-93h506th2f45hf",
                "evidence_metadata": {
                  "evidence_classification": "score_3_strength"
                }
              }
            ]
          },
```

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