Change IPython to Jupyter in eposide 06

Author: mlangseth

_episodes/06-loops-and-functions.md

@@ -453,7 +453,7 @@ yearly_data_csv_writer(1977, 2002, surveys_df)
 ~~~
 {: .language-python}
 
-BEWARE! If you are using IPython Notebooks and you modify a function, you MUST
+BEWARE! If you are using Jupyter Notebooks and you modify a function, you MUST
 re-run that cell in order for the changed function to be available to the rest
 of the code. Nothing will visibly happen when you do this, though, because
 defining a function without *calling* it doesn't produce an output. Any