Remove remarks about out of support .NET versions (System.Data, System.Net, System.Numerics)

[gewarren]

Contributes to #12648.

[Copilot]

Pull request overview

This PR updates ECMA XML API reference documentation to remove explicit references to out-of-support .NET versions (notably .NET 5–7) across several namespaces, by rewording remarks, exception descriptions, and behavioral notes.

Changes:

• Rewords remarks and exceptions to remove version-specific qualifiers across System.Numerics, System.Net.*, System.IO.Compression, System.Data, System.Diagnostics, and System.Globalization.
• Simplifies/modernizes transport and behavior explanations for HTTP APIs (HttpClient/handlers).
• Updates enum/member descriptions that previously called out version-specific obsoletion or behavior changes.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 19 comments.

Show a summary per file

File	Description
xml/System.Numerics/Vector4.xml	Rewords Lerp remarks to remove the “.NET 5” reference while keeping the compatibility link.
xml/System.Numerics/Vector2.xml	Rewords Lerp remarks to remove the “.NET 5” reference while keeping the compatibility link.
xml/System.Numerics/Vector`1.xml	Removes “.NET 5 and later” qualifiers from repeated NotSupportedException text.
xml/System.Net.Sockets/Socket.xml	Removes version qualifiers from several APM cancellation and exception notes.
xml/System.Net.Sockets/MulticastOption.xml	Removes “.NET 5 and later” qualifier from an exception description.
xml/System.Net.Security/SslClientAuthenticationOptions.xml	Removes “.NET 7 and later” qualifier from SNI-related value text.
xml/System.Net.Security/SslCertificateTrust.xml	Rewords platform/version support notes for trusted issuer list behavior.
xml/System.Net.Security/EncryptionPolicy.xml	Removes “Starting in .NET 7” phrasing from member summaries.
xml/System.Net.NetworkInformation/Ping.xml	Removes “.NET 7 and later” qualifier from Linux-specific exception text.
xml/System.Net.Http/WinHttpHandler.xml	Removes “Starting in .NET 5” phrasing for runtime inclusion note.
xml/System.Net.Http/SocketsHttpHandler.xml	Simplifies default value description by removing older-version defaults.
xml/System.Net.Http/HttpClientHandler.xml	Removes historical “.NET Core 2.1” transport description.
xml/System.Net.Http/HttpClient.xml	Removes older-version transport/behavior distinctions and edits timeout notes.
xml/System.IO.Compression/GZipStream.xml	Removes “Starting in .NET 6” phrasing from partial read IMPORTANT notes.
xml/System.IO.Compression/DeflateStream.xml	Removes “Starting in .NET 6” phrasing from partial read IMPORTANT notes.
xml/System.IO.Compression/BrotliStream.xml	Removes “.NET 7 and later” qualifier from invalid CompressionLevel exception text.
xml/System.Globalization/CompareOptions.xml	Removes “.NET 5 and later” phrasing and rewords ICU behavior section.
xml/System.Diagnostics/Debug.xml	Rewords remarks to remove “introduced in .NET 6” phrasing.
xml/System.Diagnostics/ActivityLink.xml	Condenses equality behavior history into version-agnostic statements.
xml/System.Diagnostics.Tracing/EventWrittenEventArgs.xml	Removes “Starting with .NET Core 2.2” phrasing from runtime event subscription note.
xml/System.Data/SerializationFormat.xml	Removes “starting in .NET 7” phrasing from Binary obsoletion remarks.
xml/System.Data/DataTable.xml	Removes “.NET 7 and later” qualifiers from serialization/binary-related exception text.
xml/System.Data/DataSet.xml	Removes “.NET 7 and later” qualifiers from serialization/binary-related exception text.
xml/ns-System.Web.xml	Simplifies namespace summary by removing framework/moniker-specific wording.

[gewarren]

Suggested change

	<summary>This namespace contains the <see cref="T:System.Web.HttpUtility" /> class.</summary>
	<summary>To be added.</summary>