docs: sync with official Polymarket docs (2026-07-09)
Updates across 25 files:
- api-reference/core: get-user-combo-activity, get-user-combo-positions
- dev-tooling/python
- polymarket-learn/FAQ: wen-token, what-are-prediction-markets, why-do-i-need-crypto
- polymarket-learn/deposits: coinbase, how-to-withdraw, moonpay, usdc-on-eth
- polymarket-learn/get-started: how-to-deposit, how-to-signup, making-your-first-trade, what-is-polymarket
- polymarket-learn/markets: dispute, how-are-markets-clarified, how-are-markets-created, how-are-markets-resolved
- polymarket-learn/trading: holding-rewards, how-are-prices-calculated, limit-orders, liquidity-rewards, market-orders, no-limits
- resources/error-codes
GLaDOS
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