Light Freshness Edit: ASP.NET - host-and-deploy and mvc

[lootle1]

This PR contains freshness updates to the following articles:

• Visual Studio publish profiles (.pubxml) for ASP.NET Core app deployment
• Host ASP.NET Core in a Windows Service
• Handle requests with controllers in ASP.NET Core MVC
• Filters in ASP.NET Core
• Upload files in ASP.NET Core

Minor grammar/style updates. Link updates.
For request details, see 568764

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Internal previews

📄 File	🔗 Preview link
aspnetcore/host-and-deploy/visual-studio-publish-profiles.md	Visual Studio publish profiles (.pubxml) for ASP.NET Core app deployment
aspnetcore/host-and-deploy/windows-service.md	Host ASP.NET Core in a Windows Service
aspnetcore/mvc/controllers/actions.md	Handle requests with controllers in ASP.NET Core MVC
aspnetcore/mvc/controllers/filters.md	aspnetcore/mvc/controllers/filters
aspnetcore/mvc/models/file-uploads.md	Upload files in ASP.NET Core

[lootle1]

@tdykstra @wadepickett this PR is ready for review. Top comment has an overview but let me know if any other change requests. Thank you!

[tdykstra]

Suggested change

	The first few bytes at the start of a file determines a file's signature. These bytes can be used to indicate if the extension matches the content of the file. The sample app checks file signatures for a few common file types. In the following example, the file signature for a JPEG image is checked against the file:
	The first few bytes at the start of a file determine the file's signature. These bytes can be used to indicate if the extension matches the content of the file. The sample app checks file signatures for a few common file types. In the following example, the file signature for a JPEG image is checked against the file: