Update signalr-howto-troubleshoot-guide.md

[bribeiro-msft]

Was trying this sample and noticed that it was not working. Checking the official docs https://learn.microsoft.com/en-us/dotnet/framework/performance/thread-pool-etw-events#threadpoolworkerthreadadjustmentadjustment it appears we are inspecting the wrong index.

Can you confirm if my understanding is correct and the change is good? Tested with a .NET 7 app.

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[Court72]

@vicancy

Can you review the proposed changes?

When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team

[prmerger-automator[bot]]

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[vicancy]

#sign-off

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@bribeiro-msft : Thanks for your contribution! The author(s) have been notified to review your proposed change.