Document MBMS download request metadata

[jonathanpeppers]

Summary

• Documented source-backed DownloadRequest metadata accessors and size limits in Android.Telephony.Mbms.
• Corrected the size-limit descriptions to match the serialization paths used by the Android implementation.
• Refs Add XML documentation for Android.Telephony.Mbms #245

Sources

• https://developer.android.com/reference/android/telephony/mbms/DownloadRequest
• https://android.googlesource.com/platform/frameworks/base/+/refs/heads/main/telephony/java/android/telephony/mbms/DownloadRequest.java (AOSP source used to resolve the size-limit documentation gap)

Validation

• Parsed docs/xml/Android.Telephony.Mbms/DownloadRequest.xml as XML.
• Confirmed CRLF line endings with no lone LF characters.
• Ran git diff --check.

[Copilot]

Pull request overview

This PR updates the generated XML documentation for Android.Telephony.Mbms.DownloadRequest, replacing several “To be added.” placeholders with concrete descriptions of metadata accessors and size limit properties.

Changes:

• Added summaries/values for DestinationUri, FileServiceId, SourceUri, and SubscriptionId.
• Filled in <value> documentation for the Max* size limit properties.

Suppressed comments (1)

docs/xml/Android.Telephony.Mbms/DownloadRequest.xml:309

• The documentation for MaxDestinationUriSize currently describes the app's download-completion intent (Intent#toUri(int)), but getMaxDestinationUriSize() is the limit for the destination URI/path serialized via Uri#toString(). This appears swapped with MaxAppIntentSize and should be corrected (including the duplicated text).

        <summary>Maximum permissible length for the app's download-completion intent, when serialized via
            <c>Intent#toUri(int)</c>.</summary>
        <value>Maximum permissible length for the app's download-completion intent, when serialized via
            <c>Intent#toUri(int)</c>.</value>

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

The MBMS download request contracts, URI behavior, and size-limit semantics now match Android.