Update error code document of oav tool

[raych1]

Adding the description about traffic payload in related error code document.

[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.

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

[openapi-pipeline-app]

Swagger pipeline restarted successfully, please wait for status update in this comment.

[openapi-workflow-bot]

Hi @raych1, 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

If you need further help, please feedback via swagger feedback."

[raych1]

@akning-ms , please force merge this PR since avocado failure is expected failure.