Document Android.Window back events

[jonathanpeppers]

Summary

• Document the public value contracts for Android.Window.BackEvent frame time, progress, swipe edge, and touch coordinates.
• Document Android.Window.BackEventEdge and all of its values from the Android BackEvent reference.
• Leave binding-only members and the remaining Android.Window placeholders for follow-up work.

Sources

• https://developer.android.com/reference/android/window/BackEvent

Validation

• Parsed both changed XML files with System.Xml.XmlDocument.
• Confirmed CRLF line endings and ran git diff --check.
• Confirmed the focused diff removes ten public documentation placeholders.

Refs #194

[Copilot]

Pull request overview

This PR updates the Android.Window XML reference documentation to replace “To be added.” placeholders with concrete value-contract documentation for BackEvent and the BackEventEdge enum, aligning the bindings docs more closely with the Android reference.

Changes:

• Added enum-level and member-level documentation for Android.Window.BackEventEdge.
• Filled in <value> documentation for several Android.Window.BackEvent properties (frame time, progress, swipe edge, touch coordinates).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/xml/Android.Window/BackEventEdge.xml	Replaces placeholder type/member docs with descriptive summaries/remarks for the enum and its values.
docs/xml/Android.Window/BackEvent.xml	Replaces placeholder <value> docs with explicit value contracts for several properties.

Suppressed comments (1)

docs/xml/Android.Window/BackEvent.xml:587

• <see langword="…" /> is intended for language keywords (e.g., null, true), not numeric constants. Using langword="NaN" may not render as intended in generated docs. Use inline code formatting (consistent with the surrounding docs) or a cref to the NaN constant instead.

        <value>The absolute Y location of the touch point, or <see langword="NaN" /> for a button press.</value>

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

The back-event values and edge semantics match Android, with formatting and attribution findings resolved.