Add Last System.Drawing Documentation for .NET 9

[lonitra]

Summary

Addresses remaining missing documentation for System.Drawing as outlined https://github.com/dotnet/winforms/issues/11858#issuecomment-2387143098 Fixes https://github.com/dotnet/winforms/issues/11858

[lonitra]

cc: @carlossanlop

[learn-build-service-prod[bot]]

Learn Build status updates of commit 18ac7ff:

:warning: Validation status: warnings

File	Status	Preview URL	Details
xml/System.Drawing/SystemColors.xml	:warning:Warning	View	Details
xml/ns-System.Drawing.Imaging.Effects.xml	:white_check_mark:Succeeded	View
xml/System.Drawing.Imaging.Effects/Effect.xml	:white_check_mark:Succeeded	View

xml/System.Drawing/SystemColors.xml

• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'KnownColor'.
• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'SystemColors'.
• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Color.FromKnownColor(KnownColor)'.
• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'KnownColor'.
• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Color'.
• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Color'.
• Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'KnownColor'.

For more details, please refer to the build report.

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 339c17b:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
xml/ns-System.Drawing.Imaging.Effects.xml	:white_check_mark:Succeeded	View
xml/System.Drawing.Imaging.Effects/Effect.xml	:white_check_mark:Succeeded	View
xml/System.Drawing/SystemColors.xml	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[dotnet-policy-service[bot]]

Tagging subscribers to this area: @dotnet/area-system-drawing

[learn-build-service-prod[bot]]

Learn Build status updates of commit 97f1ff2:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
xml/ns-System.Drawing.Imaging.Effects.xml	:white_check_mark:Succeeded	View
xml/System.Drawing.Imaging.Effects/Effect.xml	:white_check_mark:Succeeded	View
xml/System.Drawing/SystemColors.xml	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod[bot]]

Learn Build status updates of commit 9a8d429:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
xml/ns-System.Drawing.Imaging.Effects.xml	:white_check_mark:Succeeded	View
xml/System.Drawing.Imaging.Effects/Effect.xml	:white_check_mark:Succeeded	View
xml/System.Drawing/SystemColors.xml	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[lonitra]

@gewarren @carlossanlop if all looks good could you please merge?