update attestation swagger

[shleiAmy]

Latest improvements:

MSFT employees can try out our new experience at OpenAPI Hub - one location for using our validation tools and finding your workflow.

Contribution checklist:

• [X ] I have reviewed the documentation for the workflow.
• [ X] Validation tools were run on swagger spec(s) and have all been fixed in this PR.
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• Service team MUST add the "WaitForARMFeedback" label if the management plane API changes fall into one of the below categories.
• adding/removing APIs.
• adding/removing properties.
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[openapi-sdkautomation]

SDK Automation [Logs] (Generated from 03f62ed, Iteration 4)

No readme.md specification configuration files were found that are associated with the files modified in this pull request.

[AutorestCI]

Automation for azure-sdk-for-python

Nothing to generate for azure-sdk-for-python

[AutorestCI]

Automation for azure-sdk-for-go

Nothing to generate for azure-sdk-for-go

[nschonni]

Might be worth fixing #6624 if you're making changes

[azuresdkci]

Can one of the admins verify this patch?

[AutorestCI]

Automation for azure-sdk-for-java

Encountered an unknown error: (azure-sdk-for-java)

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/azure_devtools/ci_tools/github_tools.py", line 33, in exception_to_github
    yield context
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github.py", line 172, in rest_handle_action
    return rest_pull_sync(body, restapi_repo, sdk_pr_target_repo, sdkbase, sdk_tag)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github.py", line 200, in rest_pull_sync
    rest_pr_management(rest_pr, sdk_pr_target_repo, sdk_tag, sdk_default_base)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github_handler.py", line 151, in rest_pr_management
    sdk_tag=sdk_tag
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/SwaggerToSdkNewCLI.py", line 241, in generate_sdk_from_git_object
    raise ValueError("Unable to locate configuration in {}".format(branch_list))
ValueError: Unable to locate configuration in ['restapi_auto_attestation/resource-manager', 'restapi_auto_6655', 'master']

[shleiAmy]

@myronfanqiu could you please review this pr? I was waiting for the pull request to close to update the SDK. Thanks.

[mmyyrroonn]

If you want to generate net sdk, you should provide the readme.csharp.md file under this folder. Then the CI will try to generate the SDK and check the process.

[mmyyrroonn]

It seems that this is the real change. Since this is a preview version and this will not bring breaking change. I think it's ok.

[shleiAmy]

@myronfanqiu The readme.md file is already generated and published in the repo under https://github.com/Azure/azure-rest-api-specs/tree/master/specification/attestation/resource-manager .
This pull request is only a update for the existing attestation.jaon file.