Document XmlPullParserFactory values

[jonathanpeppers]

Summary

• Document eight source-supported XmlPullParserFactory values and return/parameter details.
• Leave the two JNI-binding placeholders untouched because they have no matching Java/Android source documentation.

Refs #250

Sources

• Official Android reference: https://developer.android.com/reference/org/xmlpull/v1/XmlPullParserFactory
• AOSP implementation for protected implementation details: https://android.googlesource.com/platform/libcore/+/master/xml/src/main/java/org/xmlpull/v1/XmlPullParserFactory.java

Validation

• Parsed all 9 Org.XmlPull.V1 XML documents successfully.
• Preserved CRLF line endings (0 bare LF lines).
• Scoped To be added placeholders: 182 -> 174; XmlPullParserFactory: 10 -> 2.
• git diff --check

[Copilot]

Pull request overview

This PR improves the generated XML documentation for Org.XmlPull.V1.XmlPullParserFactory by replacing several To be added. placeholders with source-backed descriptions of properties, parameters, and return values, while explicitly leaving JNI-binding placeholders untouched when no matching Android/Java docs exist.

Changes:

• Documented previously-undocumented property <value> text (e.g., feature map, parser/serializer class lists, and an unused compatibility property).
• Added <returns> documentation for both NewInstance() overloads and clarified unused parameters on the 2-arg overload.

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

The XmlPullParserFactory values, creation contracts, managed signatures, and attribution match the source APIs.