Re: [whatwg/fetch] consider adding note that CORS preflight check excludes headers added by the browser or extensions (#1005)

As sleevi@ pointed out we can write this in a way that does not mention extensions.  For example:

"Note: Browsers typically only apply the CORS preflight check against headers that can be directly or indirectly set from web content.  Browsers may add other headers internally that are not subjected to this check."

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