Remove outdated docs

[beto-rodriguez]

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[Copilot]

Pull request overview

This PR removes previously commented-out guidance/workarounds in sample projects and re-enables the corresponding XAML styling now that the samples appear to be targeting updated platform/tooling (notably Uno SDK).

Changes:

• Re-enabled previously commented XAML styling by using nested markup extensions (e.g., Frame → SolidColorPaint, SolidColorPaint → Dashed) across multiple WinUI sample views.
• Updated UnoPlatformSample to a newer Uno.Sdk version and added a build warning suppression.
• Removed per-view font/typeface configuration snippets from WinForms/EtoForms LabelsFormat2 samples.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
samples/WinUISample/WinUISample/Samples/StepLines/Area/View.xaml	Enables DrawMarginFrame using nested markup extensions.
samples/WinUISample/WinUISample/Samples/Lines/Padding/View.xaml	Enables DrawMarginFrame using nested markup extensions.
samples/WinUISample/WinUISample/Samples/Lines/Area/View.xaml	Enables DrawMarginFrame using nested markup extensions.
samples/WinUISample/WinUISample/Samples/General/Sections2/View.xaml	Enables section stroke styling with nested Dashed path effect.
samples/WinUISample/WinUISample/Samples/Design/StrokeDashArray/View.xaml	Enables dashed stroke styling via nested markup extensions.
samples/WinUISample/WinUISample/Samples/Axes/Style/View.xaml	Enables chart/axis styling using nested markup extensions (frame + dashed separators).
samples/WinUISample/WinUISample/Samples/Axes/MatchScale/View.xaml	Enables DrawMarginFrame using nested markup extensions.
samples/WinFormsSample/Axes/LabelsFormat2/View.cs	Removes non-Latin font registration snippet from the view constructor.
samples/EtoFormsSample/Axes/LabelsFormat2/View.cs	Removes non-Latin font registration snippet from the view constructor.
samples/UnoPlatformSample/UnoPlatformSample/UnoPlatformSample.csproj	Bumps Uno.Sdk and suppresses MSB4240.

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