Document Android transition modes

[jonathanpeppers]

Summary

• Document FadingMode, VisibilityMode, TransitionOrdering, and MatchTarget, including all ten enum values.
• Link Android reference documentation for each enum type and explicit AOSP source attribution for matching-constant details absent from the public reference.

Sources

• https://developer.android.com/reference/android/transition/Fade
• https://developer.android.com/reference/android/transition/Visibility
• https://developer.android.com/reference/android/transition/TransitionSet
• https://developer.android.com/reference/android/transition/Transition
• https://android.googlesource.com/platform/frameworks/base/+/refs/heads/main/core/java/android/transition/Transition.java

Validation

• Parsed all four changed XML files with System.Xml.XmlReader.
• Confirmed CRLF line endings and no remaining To be added placeholders in the changed files.
• Ran git diff --check origin/main...HEAD.

Refs #212

[Copilot]

Pull request overview

This PR improves the generated XML documentation for Android.Transitions by replacing placeholder text with meaningful descriptions for three transition-related enum types and their values, and by adding links to the official Android reference docs that define their behavior.

Changes:

• Updated type-level <summary> docs for FadingMode, VisibilityMode, and TransitionOrdering.
• Replaced To be added. placeholders with concrete value descriptions for all six enum members.
• Added per-type remarks linking to the corresponding Android Java reference pages.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/xml/Android.Transitions/FadingMode.xml	Adds proper enum and member summaries plus a link to the Android Fade reference.
docs/xml/Android.Transitions/VisibilityMode.xml	Adds proper enum and member summaries plus a link to the Android Visibility reference.
docs/xml/Android.Transitions/TransitionOrdering.xml	Adds proper enum and member summaries plus a link to the Android TransitionSet reference.

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[jonathanpeppers]

@dalexsoto review