update Long Running Operation guidance

[ctaggart]

I'm seeking clarification of how long running operations are supposed to be modeled. Here is how I think it works now. I'll be bringing this up in ARM office hours today.

related: ctaggart#7

[openapi-workflow-bot]

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[openapi-pipeline-app]

Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️LintDiff succeeded [Detail] [Expand]

Validation passes for LintDiff.

️❌Avocado: 1 Errors, 0 Warnings failed [Detail]

Rule	Message
❌ MISSING_README	Can not find readme.md in the folder. If no readme.md file, it will block SDK generation. folder: work/1/c93b354fd9c14905bb574a8834c4d69b/documentation

️️✔️ModelValidation succeeded [Detail] [Expand]

Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

️️✔️[Staging] Cross Version BreakingChange (Base on preview version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️[Staging] Cross Version BreakingChange (Base on stable version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️CredScan succeeded [Detail] [Expand]

There is no credential detected.

️️✔️[Staging] SDK Track2 Validation succeeded [Detail] [Expand]

Validation passes for SDKTrack2Validation

_{Posted by Swagger Pipeline | How to fix these errors?}

[openapi-pipeline-app]

Swagger Generation Artifacts

️️✔️[Staging] ApiDocPreview succeeded [Detail] [Expand]

_{Posted by Swagger Pipeline | How to fix these errors?}

[openapi-workflow-bot]

Hi @ctaggart, Your PR has some issues. Please fix the CI sequentially by following the order of Avocado, semantic validation, model validation, breaking change, lintDiff.

Task	How to fix	Priority	Support (Microsoft alias)
Avocado	Fix-Avocado	High	ruowan
Semantic validation	Fix-SemanticValidation-Error	High	raychen, jianyxi
Model validation	Fix-ModelValidation-Error	High	raychen,jianyxi
LintDiff	Fix-LintDiff	high	jianyxi, ruoxuan

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[ctaggart]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[ctaggart]

I was wrong. The Swagger documents response codes of the initial response as well.