Merge pull request #2740 from freqtrade/doc/backtest_typo

Update Backtesting fee documentation
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@ -79,12 +79,14 @@ Please also read about the [strategy startup period](strategy-customization.md#s
Sometimes your account has certain fee rebates (fee reductions starting with a certain account size or monthly volume), which are not visible to ccxt.
To account for this in backtesting, you can use `--fee 0.001` to supply this value to backtesting.
This fee must be a percentage, and will be applied twice (once for trade entry, and once for trade exit).
This fee must be a ratio, and will be applied twice (once for trade entry, and once for trade exit).
```bash
freqtrade backtesting --fee 0.001
```
!!! Note
Only supply this option (or the corresponding configuration parameter) if you want to experiment with different fee values. By default, Backtesting fetches the default fee from the exchange pair/market info.
#### Running backtest with smaller testset by using timerange