Add new Polymarket documentation (2026-02-16)

docs/polymarket-learn/deposits/how-to-withdraw.md

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+# How to Withdraw
+
+> How to withdraw your cash balance from Polymarket.
+
+Withdrawing from Polymarket is simple, instant, and free.
+
+<Steps>
+  <Steps.Step>
+    Go to the Polymarket funds page and click on the **Withdraw** button.
+  </Steps.Step>
+
+  <Steps.Step>
+    Enter the USDC address you wish to withdraw to. Make sure the address
+    supports USDC on the Polygon network. Then, enter the amount you want to
+    withdraw.
+  </Steps.Step>
+
+  <Steps.Step>
+    Click **Withdraw**. Your funds will be transferred instantly.
+  </Steps.Step>
+</Steps>
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/fAXn0LCPTgA?si=JsYilGM3h0jSNBZa" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen />
+
+<Note>
+  Note: When withdrawing USDC.e (bridged USDC) is swapped through the [Uniswap v3 pool](https://polygonscan.com/address/0xd36ec33c8bed5a9f7b6630855f1533455b98a418)
+  for USDC (native) (the UI enforces less than 10bp difference in output
+  amount). At times, this pool may be exhausted and for extremely large deposits
+  there might not be enough liquidity. If you are having withdraw issues, try
+  breaking your withdraw into smaller amounts or waiting for the pool to be
+  rebalanced. Additionally, you can select to withdraw USDC.e directly which
+  does not require any Uniswap liquidity; just be aware that some exchanges no
+  longer allow USDC.e to be deposited directly.
+</Note>