Update AlphaOption.cs xml docs #624

Job	Run time
MacOS (Q8/Q16/Q16-HDRI)	3m 55s
Linux (Q8/Q16/Q16-HDRI, x64)	8m 8s
Linux musl (Q8/Q16/Q16-HDRI, x64)	6m 48s
Library (Core)	6m 39s
Linux (Q8/Q16/Q16-HDRI, arm64)	1h 15m 49s
Library (SystemDrawing)	6m 32s
Library (SystemWindowsMedia)	6m 25s
Windows (Q8, x86)	6m 30s
Windows (Q8, x64)	6m 44s
Windows (Q8, arm64)	6m 29s
Windows (Q8, Any CPU)	6m 35s
Windows (Q8-OpenMP, x64)	6m 37s
Windows (Q8-OpenMP, arm64)	6m 23s
Windows (Q16, x86)	6m 32s
Windows (Q16, x64)	6m 38s
Windows (Q16, arm64)	6m 28s
Windows (Q16, Any CPU)	6m 33s
Windows (Q16-OpenMP, x64)	6m 37s
Windows (Q16-OpenMP, arm64)	6m 39s
Windows (Q16-HDRI, x86)	7m 1s
Windows (Q16-HDRI, x64)	6m 49s
Windows (Q16-HDRI, arm64)	6m 40s
Windows (Q16-HDRI, Any CPU)	6m 40s
Windows (Q16-HDRI-OpenMP, x64)	6m 30s
Windows (Q16-HDRI-OpenMP, arm64)	6m 34s
	3h 53m 15s

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