Update _episodes/04-data-types-and-format.md

Author: orchid00

_episodes/04-data-types-and-format.md

@@ -17,7 +17,7 @@ objectives:
 keypoints:
     - "Pandas uses other names for data types than Python, for example: “object" for textual data."
     - "A column in a DataFrame can only have one data type."
-    - "The type of one column in a DataFrame can be checked using `dataFrameName[column_name].dtype`"
+    - "The data type in a DataFrame’s single column can be checked using `dtype`."
     - "Make conscious decisions about how to manage missing data"
     - "A DataFrame can be saved to a CSV file using `pd.read_csv`"
 ---