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

Also, I thought whatwg was focused on describing what browsers implement instead of theoretical purity.  The reality is that browsers have implemented the distinction between content-set headers and browser-set headers when it comes to CORS preflights for a long time.  We ran into a lot of compat pain when we tried to remove the distinction in order to conform strictly to the current spec text.

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