Remove SokcetException from Begin*** methods for 6.0

[antonfirsov]

There is an ongoing refactor in 6.0 (dotnet/runtime#43845), resulting in the Socket.Begin*** methods no longer throwing SocketException. We should remove SocketException from the exception list of the methods being refactored for 6.0, hopefully all of them.

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Issue Details

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There is an ongoing refactor in 6.0 (dotnet/runtime#43845), resulting in the Socket.Begin*** methods no longer throwing SocketException. We should remove SocketException from the exception list of the methods being refactored for 6.0, hopefully all of them.

Author:	antonfirsov
Assignees:	-
Labels:	:watch: Not Triaged, Pri3, area-System.Net.Sockets
Milestone:	-