Add position_adjustment_enable config keyword to enable it.

freqtrade/configuration/configuration.py

@@ -173,6 +173,9 @@ class Configuration:
         if 'sd_notify' in self.args and self.args['sd_notify']:
             config['internals'].update({'sd_notify': True})
 
+        if config.get('position_adjustment_enable', False):
+            logger.warning('`position_adjustment` has been enabled for strategy.')
+
     def _process_datadir_options(self, config: Dict[str, Any]) -> None:
         """
         Extract information for sys.argv and load directory configurations