Call WebApplication.CreateBuilder(args) only once

[tdykstra]

Fixes #34216

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aspnetcore/fundamentals/configuration/index.md	Configuration in ASP.NET Core

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aspnetcore/fundamentals/configuration/index.md:63

• [nitpick] The sentence could be rephrased for clarity: 'Although this article mentions WebApplication.CreateBuilder(args) multiple times, application code should call this method only once.'

> While this article mentions `WebApplication.CreateBuilder(args)` many times, application code should call this method only once.

[Rick-Anderson]

overreaction to one customer and too much bling. I'd change it to:
Do a search on WebApplication.CreateBuilder(args), all the code samples show it's only called once. This is not a recurrent problem.

NOTE:: WebApplication.CreateBuilder(args) should only be called once.

The 2nd time you call it
var builder = WebApplication.CreateBuilder(

you get a compiler error.
I'm not sure I'd even need a warn. We can't overreact to every error a customer makes and spam the topic with warnings.

[Rick-Anderson]

Suggested change

	> [!IMPORTANT]
	> While this article mentions `WebApplication.CreateBuilder(args)` many times, application code should call this method only once. For more information, see [this IIS Support blog post](https://techcommunity.microsoft.com/blog/iis-support-blog/asp-net-core-503-server-has-been-shutdown/3830338).
	Note: `WebApplication.CreateBuilder(args)` should only be called once.