Scraping does not handle `TupleConsExpr` when parsing example HCL code from
Terraform documentation.

Example 1):

```hcl
    require_attestations_by = [google_binary_authorization_attestor.attestor.name]
```

Does not add:

```
cluster_admission_rules.require_attestations_by: google_binary_authorization_attestor.attestor.name
```

As it should since the reference is contained in a _list_.

1) https://github.com/hashicorp/terraform-provider-google/blob/v5.39.0/website/docs/r/binary_authorization_policy.html.markdown?plain=1#L49

Signed-off-by: Rickard von Essen <rickard.von.essen@gmail.com>

This correctly parses references contained in lists and adds them to the map of
references.

Example 1):

```hcl
    require_attestations_by = [google_binary_authorization_attestor.attestor.name]
```

Correctly generates a ref and building `provider-upjet-gcp` with this change
produces the expected `examples-generated/binaryauthorization/v1beta2/policy.yaml`
with this diff compared to without this change.

```
@@ -14,8 +14,8 @@ spec:
     - cluster: us-central1-a.prod-cluster
       enforcementMode: ENFORCED_BLOCK_AND_AUDIT_LOG
       evaluationMode: REQUIRE_ATTESTATION
-      requireAttestationsBy:
-      - ${google_binary_authorization_attestor.attestor.name}
+      requireAttestationsByRefs:
+      - name: attestor
     defaultAdmissionRule:
     - enforcementMode: ENFORCED_BLOCK_AND_AUDIT_LOG
       evaluationMode: ALWAYS_ALLOW
```

1) https://github.com/hashicorp/terraform-provider-google/blob/v5.39.0/website/docs/r/binary_authorization_policy.html.markdown?plain=1#L49

Signed-off-by: Rickard von Essen <rickard.von.essen@gmail.com>

Signed-off-by: Rickard von Essen <rickard.von.essen@gmail.com>