Update ci-fix.md: link to LintDiff rules.md + make the ruleset more discoverable

[konrad-jamrozik]

This PR doesn't update any API specs; instead, it updates API spec validation tooling rule violation troubleshooting guidance at https://aka.ms/ci-fix

I am owner of the tool for which I updated the guidance. (LintDiff / https://github.com/Azure/azure-openapi-validator)

[openapi-workflow-bot]

Hi, @konrad-jamrozik Thanks for your PR. I am workflow bot for review process. Here are some small tips.

Please ensure to do self-check against checklists in first PR comment.

PR assignee is the person auto-assigned and responsible for your current PR reviewing and merging.

For specs comparison cross API versions, Use API Specs Comparison Report Generator

If there is CI failure(s), to fix CI error(s) is mandatory for PR merging; or you need to provide justification in PR comment for explanation. How to fix?

Any feedback about review process or workflow bot, pls contact swagger and tools team. vscswagger@microsoft.com

[openapi-pipeline-app]

Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️Breaking Change(Cross-Version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️CredScan succeeded [Detail] [Expand]

There is no credential detected.

️️✔️LintDiff succeeded [Detail] [Expand]

Validation passes for LintDiff.

️️✔️Avocado succeeded [Detail] [Expand]

Validation passes for Avocado.

️️✔️ApiReadinessCheck succeeded [Detail] [Expand]

️️✔️~[Staging] ServiceAPIReadinessTest succeeded [Detail] [Expand]

Validation passes for ServiceAPIReadinessTest.

️️✔️SwaggerAPIView succeeded [Detail] [Expand]

️️✔️CadlAPIView succeeded [Detail] [Expand]

️️✔️TypeSpecAPIView succeeded [Detail] [Expand]

️️✔️ModelValidation succeeded [Detail] [Expand]

Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

️️✔️PoliCheck succeeded [Detail] [Expand]

Validation passed for PoliCheck.

️️✔️PrettierCheck succeeded [Detail] [Expand]

Validation passes for PrettierCheck.

️️✔️SpellCheck succeeded [Detail] [Expand]

Validation passes for SpellCheck.

️️✔️Lint(RPaaS) succeeded [Detail] [Expand]

Validation passes for Lint(RPaaS).

️️✔️CadlValidation succeeded [Detail] [Expand]

Validation passes for CadlValidation.

️️✔️TypeSpec Validation succeeded [Detail] [Expand]

Validation passes for TypeSpec Validation.

️️✔️PR Summary succeeded [Detail] [Expand]

Validation passes for Summary.

_{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-pipeline-app]

Swagger pipeline restarted successfully. If there is ApiView generated, it will be updated in this comment.