Exceptions missing

Please add the list of exception types which can be thrown from method (e.g. OperationCanceledException). I am missing the exception types at very many places in .NET Core documentation.

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* ID: 7ef3b03c-9599-baf1-c6aa-fb90acaf574a
* Version Independent ID: a83762e2-cfdf-abe7-e054-74108dc546f1
* Content: [NamedPipeClientStream.ConnectAsync Method (System.IO.Pipes)](https://docs.microsoft.com/en-us/dotnet/api/system.io.pipes.namedpipeclientstream.connectasync?view=netframework-4.7.2#System_IO_Pipes_NamedPipeClientStream_ConnectAsync_System_Threading_CancellationToken_)
* Content Source: [xml/System.IO.Pipes/NamedPipeClientStream.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.IO.Pipes/NamedPipeClientStream.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**