Fix SAX parser factory feature documentation

[jonathanpeppers]

Summary

• Restore the org.xml.sax.XMLReader type omitted from the synchronous SAXParserFactory.GetFeature summary.
• Correct the related-member link to IXMLReader.GetFeature, rather than the unrelated property API.

Refs #280

Sources

• Android SAXParserFactory.getFeature(String) reference
• Android XMLReader.getFeature(String) reference
• Java SE 17 SAXParserFactory.getFeature(String) reference

Validation

• Parsed docs/xml/Javax.Xml.Parsers/SAXParserFactory.xml with PowerShell's XML parser.
• Confirmed the changed XML file has zero lone LF line endings.
• Ran git diff --check.
• Confirmed the scoped SAXParserFactory.GetFeature To be added. count is 0.
• Confirmed the namespace has 52 remaining To be added. occurrences: 42 generated SAXParser.ParseAsync fields and 10 generated JniPeerMembers fields, all excluded from this change.
• Confirmed docs/xml/index.xml is unchanged.

[Copilot]

Pull request overview

This PR updates the XML documentation for Javax.Xml.Parsers.SAXParserFactory.GetFeature(string) to better match the underlying SAX API surface, aligning the summary text and related-member link with org.xml.sax.XMLReader / IXMLReader.GetFeature.

Changes:

• Restores the missing org.xml.sax.XMLReader type reference in the GetFeature summary text.
• Updates the related-member link to point at Org.Xml.Sax.IXMLReader.GetFeature(string).

Suppressed comments (1)

docs/xml/Javax.Xml.Parsers/SAXParserFactory.xml:146

• These exception descriptions still talk about the XMLReader “property name”, but this method is GetFeature; the exception text should match the feature terminology.

        <exception cref="T:Javax.Xml.Parsers.ParserConfigurationException">if a parser cannot be created which satisfies the requested configuration.</exception>
        <exception cref="T:Org.Xml.Sax.SAXNotRecognizedException">When the underlying XMLReader does not recognize the property name.</exception>
        <exception cref="T:Org.Xml.Sax.SAXNotSupportedException">When the underlying XMLReader recognizes the property name but doesn't support the property.</exception>
        <altmember cref="M:Org.Xml.Sax.IXMLReader.GetFeature(System.String)" />

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

SAXParserFactory.GetFeature(string? name) accepts null at compile time, but Android explicitly throws Java.Lang.NullPointerException for null and the revised docs omit that requirement and exception. Please document the non-null input contract consistently with SetFeature: SAXParserFactory.xml.