Document TemporalField unit properties

[jonathanpeppers]

Summary

• Document ITemporalField.BaseUnit, IsDateBased, IsTimeBased, and RangeUnit from Java TemporalField contract documentation.

Refs #267

Sources

• Android TemporalField reference
• OpenJDK TemporalField source

Validation

• Parsed docs/xml/Java.Time.Temporal/ITemporalField.xml as XML.
• Confirmed zero To be added. placeholders remain in the scoped file.
• Confirmed CRLF line endings, git diff --check, and no index.xml or namespace-index changes.

[Copilot]

Pull request overview

This PR fills in missing XML documentation for key Java.Time.Temporal.ITemporalField unit-related members by translating the Java TemporalField contract docs into the generated .NET XML doc format.

Changes:

• Documented BaseUnit semantics and added a link to the corresponding Java reference.
• Documented IsDateBased and IsTimeBased contract behavior (including derivation notes) with reference links.
• Documented RangeUnit semantics with reference link and expanded remarks.

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

docs/xml/Java.Time.Temporal/ITemporalField.xml: the IsDateBased and IsTimeBased remarks expose raw JavaDoc tokens (ChronoField#EPOCH_DAY EPOCH_DAY and ChronoField#NANO_OF_DAY NANO_OF_DAY) instead of managed API references. Please replace them with <see cref="P:Java.Time.Temporal.ChronoField.EpochDay" /> and <see cref="P:Java.Time.Temporal.ChronoField.NanoOfDay" />.

[jonathanpeppers]

Addressed the requested correction: IsDateBased and IsTimeBased now use the managed ChronoField.EpochDay and ChronoField.NanoOfDay API references.

[jonathanpeppers]

@dalexsoto review