Update System.Numerics.Complex

[gewarren]

• Add code-fencing around some formulas
• Use LaTeX for other formulas
• Follow up for Update Complex.ToString to reflect formatting in .NET 8+ #10125 (comment)

[dotnet-policy-service]

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

[learn-build-service-prod]

Learn Build status updates of commit e6b4aea:

✅ Validation status: passed

File	Status	Preview URL	Details
docfx.json	✅Succeeded
xml/System.Numerics/Complex.xml	✅Succeeded	View

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[BillWagner]

This LGTM

[learn-build-service-prod]

Learn Build status updates of commit bfea927:

✅ Validation status: passed

File	Status	Preview URL	Details
docfx.json	✅Succeeded
xml/System.Numerics/Complex.xml	✅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]

Learn Build status updates of commit 05f0de3:

✅ Validation status: passed

File	Status	Preview URL	Details
docfx.json	✅Succeeded
xml/System.Numerics/Complex.xml	✅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