Unspecified item "the system"

In the Remarks section, it says "The following table lists the HTTP headers that are set either by properties or methods or the system."

However, there are two systems involved: the client and the server.

It should be made explicit which system sets the headers which are marked as "Set by the system to..."

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#### Document Details

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* ID: ef6969c5-99ef-0f6f-b101-50cac325de31
* Version Independent ID: d84448e0-1d4c-c942-526e-5a861a0fe51a
* Content: [HttpWebRequest Class (System.Net)](https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DEN-US%26k%3Dk(System.Net.HttpWebRequest)%3Bk(TargetFrameworkMoniker-.NETFramework%2CVersion%3Dv4.7.2)%3Bk(DevLang-VB)%26rd%3Dtrue&view=netframework-4.7.2#feedback)
* Content Source: [xml/System.Net/HttpWebRequest.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Net/HttpWebRequest.xml)
* Product: **dotnet-api**
* GitHub Login: @karelz
* Microsoft Alias: **ncldev**