Minor: Refine fee example in the docs

Taken from https://github.com/freqtrade/freqtrade/issues/2738#issuecomment-570687230. slightly reworded.
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hroff-1902 2020-01-04 01:08:37 +03:00 committed by GitHub
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@ -78,9 +78,11 @@ Please also read about the [strategy startup period](strategy-customization.md#s
#### Supplying custom fee value
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.
To account for this in backtesting, you can use the `--fee` command line option to supply this value to backtesting.
This fee must be a ratio, and will be applied twice (once for trade entry, and once for trade exit).
For example, if the buying and selling commission fee is 0.1% (i.e., 0.001 written as ratio), then you would run backtesting as the following:
```bash
freqtrade backtesting --fee 0.001
```