Document network slice enum APIs

[jonathanpeppers]

Summary

• Document the public 5G network-slice service-type, route session-type, and SSC-mode enum contracts.
• Preserve Android reference links and CC BY attribution for the source material.

Refs #240

Sources

• Android Developers: NetworkSliceInfo
• Android Developers: RouteSelectionDescriptor

Validation

• Parsed all three edited XML files with PowerShell's XML parser.
• Confirmed CRLF line endings in each edited XML file.
• Ran git diff --check.
• Confirmed scoped To be added count is 0 and docs/xml/index.xml is untouched.

[Copilot]

Pull request overview

Documents the public enum contracts for 5G network slicing and route selection in Android.Telephony.Data, replacing placeholder XML docs while preserving Android reference links and CC BY attribution.

Changes:

• Added <summary>/<remarks> content (including upstream reference links and attribution) for three enum types.
• Replaced member-level To be added. summaries with specific descriptions for each enum value.

Reviewed changes

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

File	Description
docs/xml/Android.Telephony.Data/RouteSelectionSscMode.xml	Adds enum/value documentation and attribution for SSC mode constants.
docs/xml/Android.Telephony.Data/RouteSelectionSessionType.xml	Adds enum/value documentation and attribution for session-type constants.
docs/xml/Android.Telephony.Data/NetworkSliceServiceType.xml	Adds enum/value documentation and attribution for network slice service-type constants.

Suppressed comments (2)

docs/xml/Android.Telephony.Data/RouteSelectionSessionType.xml:82

• This summary says "both IP and IPV6"; for the Ipv4v6 session type it should explicitly refer to both IPv4 and IPv6, and use standard casing.

        <summary>The route selection descriptor is for the session with both IP and IPV6 types.</summary>

docs/xml/Android.Telephony.Data/RouteSelectionSessionType.xml:110

• Use standard IPv6 casing in this summary (currently "IPV6").

        <summary>The route selection descriptor is for the session with IPV6 type.</summary>

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[jonathanpeppers]

@dalexsoto review