Update macOS keyboard shortcuts

[guardrex]

Fixes #34610

Thanks @segeda! 🚀

Tom ... @segeda reported that the macOS keyboard shortcuts in one (a few really) Blazor docs are incorrect. I confirmed here ... Ctrl+C kills an app on macOS in the command shell. Further, Ctrl+F5 starts an app without the debugger in VSC.

For the Generic Host article, I left Windows and macOS as separate shortcuts in spite of them being the same because the Windows entries (or the sentence) mention "SIGTERM/SIGINT." Let me know if you prefer removing the "SIGTERM/SIGINT" language, leaving just Ctrl+C for all CLI coverage. 👂

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[tdykstra]

Your guess is a good as mine regarding the usefulness of the "SIGTERM/SIGINT" language; I'm OK with leaving it in.