Document CheckBoxPreference overrides

[jonathanpeppers]

Refs #145

Sources

• Android CheckBoxPreference reference
• Android TwoStatePreference reference

Validation

• [xml](Get-Content -Raw 'docs\\xml\\Android.Preferences\\CheckBoxPreference.xml')
• git diff --check
• Confirmed the XML file retains CRLF working-tree line endings.

Documents four source-backed CheckBoxPreference override properties (eight placeholder fields). Twenty placeholders in this type and 293 across the remaining namespace are intentionally left for later sourced slices.

[Copilot]

Pull request overview

This PR updates the API reference XML for Android.Preferences.CheckBoxPreference by replacing placeholder documentation with sourced summaries/values for several override properties, aligning this type’s documentation more closely with the upstream Android reference and the existing TwoStatePreference docs in the repo.

Changes:

• Replaced To be added. placeholders with concrete <summary>/<value> text for Checked.
• Added concrete <summary>/<value> text for DisableDependentsState.
• Added concrete <summary>/<value> text for SummaryOffFormatted and SummaryOnFormatted.

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[jonathanpeppers]

@dalexsoto review

[dalexsoto]

SetSummaryOff(int) and SetSummaryOn(int) are public overrides but still retain To be added. summaries and parameter docs, leaving the stated override-documentation work incomplete. Please document both resource overloads, including summaryResId, and link them to the formatted summary properties: CheckBoxPreference.xml.