Add new tutorial on upgrading

[richlander]

We are about to publish a blog post on .NET 7 EOL. Past posts like that have too much content and should primarily rely on content in docs.

Example:
https://devblogs.microsoft.com/dotnet/dotnet-5-end-of-support-update/

The tutorial is intended to be that content. I didn't find a doc like this. If there is, we can use that instead.

Is this a good home?

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Internal previews

📄 File	🔗 Preview link
docs/core/install/upgrade.md	Upgrade to a new .NET version

[richlander]

I noticed a special mixture of "updating" and "upgrading". Well done!

[gewarren]

Thanks for adding this. I think it probably belongs in this section of the TOC/docs - Install .NET on Windows, Linux, and macOS | Microsoft Learn. It shouldn't be in the tutorials folder since it's not a tutorial. Specifically, it should probably live just above this article in the TOC:

[richlander]

@gewarren -- I thought about putting this doc in that exact spot. However, I hesitated. It's not really about install as an intent, but upgrading to a new version. Perhaps that's splitting hairs. I'm happy to put it there if that's what folks think is best.

It's really "getting started with a new .NET version".

[tdykstra]

@gewarren -- I thought about putting this doc in that exact spot. However, I hesitated. It's not really about install as an intent, but upgrading to a new version. Perhaps that's splitting hairs. I'm happy to put it there if that's what folks think is best.

It's really "getting started with a new .NET version".

I agree the location proposed by @gewarren isn't a perfect fit, but I think it's the best we have in this doc set. We have a whole TOC section devoted to upgrades in the ASP.NET Core docs.

[richlander]

I believe I have resolved the feedback.

Mega thanks for the help and to @gewarren for all the edits.