Fix comment about default Python

xfel_calibrate/settings.py

@@ -4,7 +4,7 @@ import sys
 # path into which temporary files from each run are placed
 temp_path = os.path.abspath("temp/")
 
-# Path to use for calling Python. If the environment is correctly set, simply the command
+# Path to use for calling Python. By default, the Python xfel-calibrate is run in.
 python_path = sys.executable
 
 # Path to find activate script