chore(cdn): unify automatically generated code style

[deer-hang]

What this PR does / why we need it:

unify automatically generated code style.

Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

PR Checklist

• Tests added/passed.

make testacc TEST='./huaweicloud/services/acceptance/cdn' TESTARGS='-run TestAccDatasourceCDNDomainCertificates_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cdn -v -run TestAccDatasourceCDNDomainCertificates_basic -timeout 360m -parallel 4
=== RUN   TestAccDatasourceCDNDomainCertificates_basic
=== PAUSE TestAccDatasourceCDNDomainCertificates_basic
=== CONT  TestAccDatasourceCDNDomainCertificates_basic
--- PASS: TestAccDatasourceCDNDomainCertificates_basic (8.23s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cdn       8.267s

make testacc TEST='./huaweicloud/services/acceptance/cdn' TESTARGS='-run TestAccDatasourceStatistics_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cdn -v -run TestAccDatasourceStatistics_basic -timeout 360m -parallel 4
=== RUN   TestAccDatasourceStatistics_basic
=== PAUSE TestAccDatasourceStatistics_basic
=== CONT  TestAccDatasourceStatistics_basic
--- PASS: TestAccDatasourceStatistics_basic (6.68s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cdn       6.760s

make testacc TEST='./huaweicloud/services/acceptance/cdn' TESTARGS='-run TestAccDatasourceCDNDomains_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/cdn -v -run TestAccDatasourceCDNDomains_basic -timeout 360m -parallel 4
=== RUN   TestAccDatasourceCDNDomains_basic
=== PAUSE TestAccDatasourceCDNDomains_basic
=== CONT  TestAccDatasourceCDNDomains_basic
--- PASS: TestAccDatasourceCDNDomains_basic (376.99s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cdn       377.031s

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

[github-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This PR has been approved by: @deer-hang

[jinyangyang222]

/lgtm