Document breaking change: Complex special-value results now follow C23 Annex G

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System.Numerics.Complex arithmetic operators and math functions now delegate to the new Complex<double> type, which produces C23 Annex G-conformant special-value results (signed zeros, infinities, NaNs) instead of the previous (NaN, NaN) fallback for many non-finite inputs.

Changes

• Added docs/core/compatibility/core-libraries/11/complex-annex-g-special-values.md describing the previous vs. new behavior, affected APIs, and recommended action
• Registered the new article in docs/core/compatibility/11.md (Core .NET libraries table)
• Added the corresponding entry to docs/core/compatibility/toc.yml

Example from the new article

using System.Numerics;

// Previously: (NaN, NaN)
// Now: (+∞, +∞)
new Complex(double.PositiveInfinity, double.PositiveInfinity) * new Complex(1.0, 0.0);

• Fixes [Breaking change]: System.Numerics.Complex special-value results now follow C23 Annex G #54845

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Internal previews

File	Preview link
docs/core/compatibility/11.md	docs/core/compatibility/11
docs/core/compatibility/core-libraries/11/complex-annex-g-special-values.md	docs/core/compatibility/core-libraries/11/complex-annex-g-special-values
docs/core/compatibility/toc.yml	docs/core/compatibility/toc

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