Cleaned up an API key related spot

Author: Chris-Schnaufer

vignettes/03-get-images-python.Rmd

@@ -42,7 +42,7 @@ vignette we show how to retrieve the list of available sensors.
 
 As mentioned in the overview, the url string will point to the API to use. In this case
 we'll be using "https://terraref.ncsa.illinois.edu/clowder/api" and the key will be the
-one you received in an email.
+one you created for your Clowder account.
 
 ```{python eval=FALSE}
 from terrautils.products import get_file_listing