make docs reflect reality, move download_all_data to new utils.py file, automatic startup_candle detection

freqtrade/strategy/interface.py

@@ -148,7 +148,7 @@ class IStrategy(ABC, HyperStrategyMixin):
     def load_freqAI_model(self) -> None:
         if self.config.get('freqai', {}).get('enabled', False):
             # Import here to avoid importing this if freqAI is disabled
-            from freqtrade.freqai.data_kitchen import (download_all_data_for_training)
+            from freqtrade.freqai.utils import download_all_data_for_training
             from freqtrade.resolvers.freqaimodel_resolver import FreqaiModelResolver
             self.freqai = FreqaiModelResolver.load_freqaimodel(self.config)
             self.freqai_info = self.config["freqai"]