Add inheritdoc elements to XML documentation

[ericstj]

Fixes dotnet/runtime#120511

Fixes missing docs for XML namespace in .NET 10.0

[Copilot]

Pull Request Overview

This PR adds <inheritdoc /> elements to XML documentation for the XmlDictionaryWriter class to fix missing documentation in .NET 10.0's XML namespace. The change leverages inheritance-based documentation to automatically pull documentation from base classes or interfaces.

• Added <inheritdoc /> elements to XML documentation
• Targeted specific methods in XmlDictionaryWriter class
• Addresses documentation gaps identified in issue #120511

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-xml

[ericstj]

Confirmed docs exist in
https://review.learn.microsoft.com/en-us/dotnet/api/system.xml.xmldictionarywriter.close?view=net-10.0&branch=pr-en-us-11911
https://review.learn.microsoft.com/en-us/dotnet/api/system.xml.xmldictionarywriter.dispose?view=net-10.0&branch=pr-en-us-11911