Improve description of AllowUpdates

[guardrex]

Fixes #37483

Ilona ... I opened a framework API summary change for this at dotnet/aspnetcore#68618. I need help interpreting and selecting the best language for Dan's remark over here ...

Add a short note near the first AllowUpdates example explaining that it doesn't control whether later mutations are captured when a circuit pauses.

I'd like to specify that we're talking about property mutations and not use the word "later" unless we end up specifying when "later" is, so my draft goes like this ...

For >=11.0 ...

PersistentStateAttribute.AllowUpdates doesn't control whether property mutations are captured when a circuit pauses due to [circuit state persistence](xref:blazor/state-management/server#circuit-state-persistence) or [tab inactivity](xref:#automatic-circuit-pause-on-tab-inactivity).

For >=10 and <11.0 ...

PersistentStateAttribute.AllowUpdates doesn't control whether property mutations are captured when a circuit pauses due to [circuit state persistence](xref:blazor/state-management/server#circuit-state-persistence).

We could also work further with the word "control" as well. Should it state something more like ...

PersistentStateAttribute.AllowUpdates doesn't result in capturing property mutations while a circuit pauses due to ...

If correct, such a change clarifies what "control" means in the original sentence.

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aspnetcore/blazor/state-management/prerendered-state-persistence.md	aspnetcore/blazor/state-management/prerendered-state-persistence
aspnetcore/blazor/state-management/server.md	aspnetcore/blazor/state-management/server