Document multiple elements return in Razor delegate

[guardrex]

Fixes #36487

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aspnetcore/blazor/components/index.md	aspnetcore/blazor/components/index

[Copilot]

Pull request overview

This PR addresses issue #36487 by adding documentation on how to return multiple elements from a Razor delegate in Blazor components. The documentation explains the use of the <text> tag for explicit delimited transitions when multiple elements need to be returned from a RenderFragment.

Key Changes:

• Added explanatory text describing the use of <text> tags with Razor delegates
• Included a practical code example demonstrating the technique
• Provided a cross-reference to the Razor syntax documentation for explicit delimited transitions

[maraf]

It's relevant also if you're returning a statement. Basically anything that is not a single root html element

return @if(...)
{
}
;

[guardrex]

@maraf ... I'm not familiar with that syntax, and I can't get something like that to compile. If you want to show an example of that, can you provide a fully working RenderFragment method?