Add MemberGroup descriptions (remainder)

[gewarren]

Contributes to #12626.

[Copilot]

Pull request overview

This PR continues the effort in #12626 by adding missing <MemberGroup> documentation so overload sets (constructors and methods) have a shared, group-level summary in the ECMA XML reference files.

Changes:

• Add constructor (.ctor) <MemberGroup> summaries to several System.ServiceModel* and Microsoft.Win32.SafeHandles* type docs.
• Add <MemberGroup> summaries for overload sets in ClientBase\1 (ICommunicationObject.Close/Open) and RegistryAclExtensions (GetAccessControl`).
• Add an overload-group <MemberGroup> for AsOpenAIResponseTool (needs a small wording correction to cover all overloads).

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
xml/System.ServiceModel/UnixDomainSocketBinding.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel/ClientBase`1.xml	Adds MemberGroup summaries for explicit ICommunicationObject.Close/Open overload sets.
xml/System.ServiceModel.Federation/WSTrustTokenParameters.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel.Federation/WSTrustChannelFactory.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel.Federation/WSTrustChannelClientCredentials.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel.Channels/UnixPosixIdentityBindingElement.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel.Channels/UnixDomainSocketTransportBindingElement.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel.Channels/TransportBindingElement.xml	Adds .ctor MemberGroup summary for constructors.
xml/System.ServiceModel.Channels/ConnectionOrientedTransportBindingElement.xml	Adds .ctor MemberGroup summary for constructors.
xml/OpenAI.Responses/MicrosoftExtensionsAIResponsesExtensions.xml	Adds MemberGroup summary for AsOpenAIResponseTool overload set (currently too narrow for all overloads).
xml/Microsoft.Win32/RegistryAclExtensions.xml	Adds MemberGroup summary for GetAccessControl overload set.
xml/Microsoft.Win32.SafeHandles/SafeWaitHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafeRegistryHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafeProcessHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafePipeHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafeNCryptKeyHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafeNCryptHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafeFileHandle.xml	Adds .ctor MemberGroup summary for constructors.
xml/Microsoft.Win32.SafeHandles/SafeAccessTokenHandle.xml	Adds .ctor MemberGroup summary for constructors.