Fix Exporting cleaned data section

I am not sure why this section starts off with "You can also export just your cleaned data, rather than the entire project" when exporting the entire project follows. The wording doesn't make sense; I changed it to something more appropriate.

episodes/09-exporting-data.md

@@ -19,7 +19,7 @@ exercises: 0
 
 ## Exporting cleaned data
 
-You can also export just your cleaned data, rather than the entire project.
+Once you are done cleaning your data, you will likely want to export it.
 
 Click `Export` in the top right and select the file type you want to export the data in. `Tab-separated value` (`tsv`) or `Comma-separated value` (`csv`) would be good choices.