Document Media Session playback flags

[jonathanpeppers]

Summary

• Document MediaController.Extras, local and remote playback types, and the public media-session handling flags.
• Leave generated interop members and unscoped placeholders untouched.

Refs #137

Sources

• https://android.googlesource.com/platform/frameworks/base/+/refs/heads/main/media/java/android/media/session/MediaController.java
• https://android.googlesource.com/platform/frameworks/base/+/refs/heads/main/media/java/android/media/session/MediaSession.java

Validation

• Parsed all changed XML files with PowerShell's XML parser.
• Confirmed CRLF line endings and git diff --check.
• Reduced Android.Media.Session placeholders from 273 to 268.

[Copilot]

Pull request overview

This PR improves the generated XML documentation for Android.Media.Session by replacing a few remaining “To be added.” placeholders with meaningful summaries/values, focusing on media session playback flags, playback types, and MediaController.Extras.

Changes:

• Documented MediaSessionFlags members for media button handling and transport controls.
• Documented MediaPlaybackType values for local vs. remote playback.
• Replaced the placeholder <value> text for MediaController.Extras.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/xml/Android.Media.Session/MediaSessionFlags.xml	Replaces placeholder summaries for public media-session handling flags.
docs/xml/Android.Media.Session/MediaPlaybackType.xml	Replaces placeholder summaries for local/remote playback type values.
docs/xml/Android.Media.Session/MediaController.xml	Replaces placeholder value text for MediaController.Extras.

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

Two media-session blockers remain:

• PlaybackInfo.PlaybackType is mapped to Android.Media.MediaPlaybackType (0/1) although Android returns session playback values 1/2; local values appear as remote and remote values are unnamed. Please correct the binding to Android.Media.Session.MediaPlaybackType and regenerate.
• Both MediaSessionFlags members are deprecated no-ops since API 26, but their summaries describe active behavior and enum-field remarks are not published. Put the no-op/deprecation guidance directly in the summaries or generate matching obsolescence metadata.