[WIP] Update documentation to reflect recent commits

[Copilot]

• Fix outdated branch references (master → main) in all docs linking to the Azure/autorest repo
• Update docs/client/initializing.md - fix outdated minimum dependency versions (azure-core 1.24.0 → 1.37.0, msrest 0.7.0 → 0.7.1, azure-mgmt-core 1.2.1 → 1.3.2) and clarify msrest is legacy-only
• Update docs/client/tracing.md - remove deprecated OpenCensus section, update OpenTelemetry example with current APIs
• Update docs/client/operations.md - replace deprecated asyncio.get_event_loop() pattern with asyncio.run()
• Update docs/client/troubleshooting.md - fix Python 3.5 logging link
• Update docs/readme.md - add mention of TypeSpec generation path
• Update docs/faq.md - add TypeSpec generation info alongside AutoRest
• Run code review and address feedback
• Run CodeQL check

Original prompt

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This section details on the original issue you should resolve

<issue_title>update docs</issue_title>
<issue_description>There are many commits recently and we need to analyze whether some docs of https://github.com/Azure/autorest.python/tree/main/docs are out of date. For outdated docs, we need update or delete them.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes update docs #3360

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