Bulk convert comments above classes/functions/methods into proper docstrings

data/band.py

@@ -1,11 +1,13 @@
 from dataclasses import dataclass
 
-# Data class that defines a band.
+
 @dataclass
 class Band:
+    """Data class that defines a band."""
+
     # Band name
     name: str
     # Start frequency, in Hz
     start_freq: float
     # Stop frequency, in Hz
-    end_freq: float
+    end_freq: float