Update static file docs and log if WebRootPath is not found #44296
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Fixes #38481
AspNetCore only serves static files from the wwwroot subfolder by default. This is different from ASP.NET Framework that served from the root directory by default.
Currently there's no warning or error if the wwwroot directory does not exist.
This adds xml docs to clarify the default, and logs warning if the wwwroot directory is missing and you have a StaticFile middleware.