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Update docs/strategy-customization.md

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Co-authored-by: Matthias <xmatthias@outlook.com>
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@ -467,7 +467,7 @@ if self.dp:
Although the ticker data structure is a part of the ccxt Unified Interface, the values returned by this method can Although the ticker data structure is a part of the ccxt Unified Interface, the values returned by this method can
vary for different exchanges. For instance, many exchanges do not return `vwap` values, the FTX exchange vary for different exchanges. For instance, many exchanges do not return `vwap` values, the FTX exchange
does not always fills in the `last` field (so it can be None), etc. So you need to carefully verify the ticker does not always fills in the `last` field (so it can be None), etc. So you need to carefully verify the ticker
data returned from the exchange you are working with. data returned from the exchange and add appropriate error handling / defaults.
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### Additional data (Wallets) ### Additional data (Wallets)