Dispose the temporary service provider in the sample code

[jramos-ceres-br]

In the examples, maybe the instance of IApiVersionDescriptionProvider will stay around in memory because of the temporary service provider is not disposed.

Current code:

// note: that we have to build a temporary service provider here because one has not been created yet
var provider = services.BuildServiceProvider().GetRequiredService<IApiVersionDescriptionProvider>();

Suggested code:

// note: that we have to build a temporary service provider here because one has not been created yet
using (var serviceProvider = services.BuildServiceProvider())
{
    var provider = serviceProvider.GetRequiredService<IApiVersionDescriptionProvider>();
    ... other code ...
}

[commonsensesoftware]

Fair point. While the examples are purely meant to an illustration and not necessarily production quality code, there's no reason to not provide sound examples. I'll queue this change in an upcoming PR that will be tracked by this issue. Thanks for the feedback.