Fix typo in comments

astronauts-analysis.py

@@ -135,7 +135,7 @@ def save(fig, filename):
 def perform_analysis():
     """ Glues data preparation and plotting. """
 
-    # Set up directory strcture and preprocess data
+    # Set up directory structure and preprocess data
     makedirs(_OUTPUT_PATH, exist_ok=True)
     df = pd.read_json(Path(_ASTRONAUT_DATA).resolve())
     df = prepare_data_set(df)