Update logging source generator docs: SYSLIB1011 now scoped to allows ref struct only

[Copilot]

dotnet/runtime#124638 removed the blanket ban on generic logging methods. SYSLIB1011 now fires only when a type parameter uses the C# 13 allows ref struct anti-constraint (unsupported because the generator stores parameters in struct fields).

Changes

• syslib1011.md — Updated title, description, and workaround to reflect the narrowed restriction
• source-generator-overview.md — Updated SYSLIB1011 table entry description
• source-generation.md — Updated "Log method constraints" bullet: generic methods are now valid; only allows ref struct is restricted

What's now valid

// Now works — no SYSLIB1011
[LoggerMessage(0, LogLevel.Trace, "Channel {Channel}: {Code}")]
public static partial void PacketReceived<TCode>(
    ILogger logger, ConnectionChannel channel, TCode code)
    where TCode : struct, Enum;

// Still emits SYSLIB1011
[LoggerMessage(1, LogLevel.Debug, "Value: {Value}")]
public static partial void LogValue<T>(
    ILogger logger, T value)
    where T : allows ref struct;

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