docs: rustdoc on disputes

[Ayomide-codex]

Adds ///-style rustdoc to every pub fn in the disputes module.

Functions that received new doc comments:

• DisputeManager::process_dispute — full entrypoint docs with auth, params, errors
• DisputeManager::vote_on_dispute — full entrypoint docs with auth, params, errors
• DisputeManager::resolve_dispute — full entrypoint docs with auth, params, errors
• DisputeManager::validate_market_for_resolution — validation docs with errors
• DisputeManager::validate_dispute_timeout_parameters — parameter validation docs
• DisputeManager::validate_dispute_timeout_extension_parameters — extension validation docs
• DisputeAnalytics::get_timeout_analytics — analytics snapshot docs

Closes #878

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