Document Java runtime namespace

[jonathanpeppers]

Summary

• Document Java.Lang.Runtimes and its ObjectMethods and SwitchBootstraps APIs.
• Add source-backed descriptions for record-object and switch bootstrap methods, including their parameters and results.
• Document managed JNI binding members and remove every scoped XML documentation placeholder.

Sources

• Android ObjectMethods reference
• Android SwitchBootstraps reference

Validation

• Parsed docs/xml/ns-Java.Lang.Runtimes.xml, docs/xml/Java.Lang.Runtimes/ObjectMethods.xml, and docs/xml/Java.Lang.Runtimes/SwitchBootstraps.xml with [xml](Get-Content -Raw ...).
• Confirmed CRLF line endings in all changed XML files.
• rg -n -i --glob 'Java.Lang.Runtimes/**' --glob 'ns-Java.Lang.Runtimes.xml' 'to be added' docs/xml (0 matches)
• git diff --check

Closes#185

[Copilot]

Pull request overview

This PR updates the namespace-level XML documentation for Java.Lang.Runtimes, aiming to replace placeholder text with meaningful docs for the namespace entry point in the generated API docs.

Changes:

• Replaced the To be added. placeholder summary/remarks in ns-Java.Lang.Runtimes.xml with real documentation text.
• Added a short <remarks> section referencing a runtime-related type.

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[jonathanpeppers]

Addressed the review by correcting the namespace scope and documenting ObjectMethods and SwitchBootstraps with Android reference links. The updated validation confirms zero scoped To be added placeholders.

[jonathanpeppers]

@dalexsoto review