Update reconnection UI guidance

[guardrex]

Description

Update the reconnection UI for the new "rejoining the server" ui experience.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr?view=aspnetcore-9.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/fundamentals/signalr.md

Document ID

d17e4c28-ea82-0dd8-295d-19f6ada147ea

Article author

@guardrex

[github-actions]

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