fix(docs/strategy-advanced/custom_info-storage/example): only add to "custom_info" in backtesting and hyperopt

docs/strategy-advanced.md

@@ -55,6 +55,7 @@ class AwesomeStrategy(IStrategy):
     def populate_indicators(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
         # using "ATR" here as example
         dataframe['atr'] = ta.ATR(dataframe)
+        if self.dp.runmode.value in ('backtest', 'hyperopt'):
           # add indicator mapped to correct DatetimeIndex to custom_info
           self.custom_info[metadata['pair']] = dataframe[['date', 'atr']].copy().set_index('date')
         return dataframe