Fix documentation referencing obsolete filename SerratedInteropHelpers.js

[Copilot]

The XML documentation for JSInteropHelpersModule.ImportAsync referenced the legacy filename SerratedInteropHelpers.js, but the actual implementation uses SerratedJSInteropShim.js.

Changes

• Updated subPath parameter documentation in JSInteropHelpersModule.cs to reference the correct default path /_content/SerratedSharp.SerratedJSInterop.Blazor/SerratedJSInteropShim.js

/// <param name="subPath">Sub path. Default is "/_content/SerratedSharp.SerratedJSInterop.Blazor/SerratedJSInteropShim.js" for loading from the Blazor RCL. Provide alternate subpath to concatenate with basePath if loading from custom location.</param>
public static async Task ImportAsync(string basePath = "", string? subPath = null)
{
    string path = basePath.TrimEnd('/') +
        (subPath ?? "/_content/SerratedSharp.SerratedJSInterop.Blazor/SerratedJSInteropShim.js");
    await JSHost.ImportAsync("SerratedJSInteropShim", path);
}

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