SupplyParameterFromQuery 8.0 updates

[guardrex]

Fixes #29547

Mackinnon ...

• We never documented [SupplyParameterFromForm] for any release. I thought it was an internal framework API bit that devs wouldn't directly use, but I'm prepared to hear what we need to cover it if that's not the case. 👂
• This is the only spot in the Blazor docs that we cover the [SupplyParameterFromQuery] attribute. If there are no other places around the Blazor docs that need to refer to the attribute, then we'll be good to go after we get this spot updated.
• Although Pre6 isn't out yet, I'm going to merge this after you sign off. I'm already working on the major updates for full-stack Blazor, and I don't want to get bogged down in a 😈 nasty merge conflict 😈 situation 😆.

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/fundamentals/routing.md	ASP.NET Core Blazor routing and navigation

[MackinnonBuck]

This looks great! I think this is still the only spot where we need to document [SupplyParameterFromQuery].

Regarding [SupplyParameterFromForm], the reason we haven't documented it for previous releases is that it's a very new feature 🙂 Its use is somewhat similar to that of [SupplyParameterFromQuery], but it binds parameters to form request entries rather than query parameters. I would suggest content about [SupplyParameterFromForm] should be added to the "Forms and Input Components" document rather than the routing docs, where [SupplyParameterFromQuery] is documented.

Issues describing the design of this feature can be found here and here. Some usage examples can be found in our test components. If this isn't the right info (or not enough info) for you to get started preparing content, please let me know!

CC @javiercn in case you have anything to add.