Clean up exceptions

[gewarren]

• Remove exceptions for Compact Framework
• Remove exceptions for old Windows versions
• Remove other exceptions when NSE is always thrown

Contributes to #12513.

[dotnet-policy-service]

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[Copilot]

Pull request overview

This PR continues the cleanup work for #12513 by removing .NET Compact Framework and legacy Windows-version-specific exception documentation from the ECMA XML reference docs, and by simplifying a few exception descriptions now that those platform distinctions aren’t relevant for modern .NET.

Changes:

• Removed .NET Compact Framework–specific NotSupportedException / ObjectDisposedException entries from several networking and reflection APIs.
• Removed legacy Windows-version-specific exception conditions (for example, Windows XP/CE notes) and simplified some multi-clause exception descriptions.
• Reformatted parts of FileSystemWatcher remarks content (table + NOTE blocks) to be cleaner markdown.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
xml/System/Type.xml	Removes .NET Compact Framework exception notes from Type member docs.
xml/System.Net/HttpWebRequest.xml	Removes Compact Framework–specific ObjectDisposedException entries from request stream APIs.
xml/System.Net.Sockets/TcpClient.xml	Simplifies ReceiveBufferSize exception text by removing Compact Framework-specific content.
xml/System.Net.Sockets/Socket.xml	Simplifies GetSocketOption exception text by removing Compact Framework-specific content.
xml/System.IO/FileSystemWatcher.xml	Removes legacy Windows remote-watching remarks and cleans up markdown formatting (table/callouts).
xml/System.IO/FileSystemInfo.xml	Removes legacy Windows XP-specific IOException wording for Delete().
xml/System.IO/FileInfo.xml	Removes legacy Windows XP-specific IOException wording for Delete().
xml/System.IO/File.xml	Simplifies IOException documentation for File.Delete.
xml/System.IO/DirectoryInfo.xml	Removes legacy Windows XP-specific handle-related exception wording from Delete() overloads.
xml/System.IO/Directory.xml	Removes Windows CE / Compact Framework NotSupportedException documentation.
xml/System.IO.Ports/SerialPort.xml	Removes Compact Framework-specific async model exception note.
xml/System.Data.Common/DbDataReader.xml	Removes exceptions that conflict with the current “NotSupportedException” statement for GetSchemaTable().

[BillWagner]

This LGTM. Let's