Fix instructions for setting up Nginx

[kant2002]

Fixes #33159

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aspnetcore/host-and-deploy/linux-nginx.md	Host ASP.NET Core on Linux with Nginx

[Rick-Anderson]

@kant2002 I don't see any differences. What's changed?

[kant2002]

I remove http. Since that’s part inside nginx.conf where sites-available included

[Rick-Anderson]

@kant2002 got it thanks, just these two changes?

Per CoPilot, the only difference is the http block has been removed.

@kant2002 Is the following correct?
The http block not necessary as it's the default context in Nginx configuration files

@javiercn please review

[kant2002]

@Rick-Anderson yes. it's correct.

[javiercn]

I have no context on how this setup works.

@BrennanConroy knows better I think.