Update _episodes/03-skimage-images.md

wording suggestion

Co-authored-by: Toby Hodges <tbyhdgs@gmail.com>

Author: quist00

episodes/03-skimage-images.md

@@ -117,7 +117,7 @@ Once we have the image in the program, we first call `plt.subplots()` so that we
 > and may use as you see fit in your own code, but the details of what it will do to 
 > display the image are currently in the process of change. Thus, calling `imshow()` off the 
 > *matplotlib.pyplot* library at this time ensures participants have the 
-> experience we need across platforms for this course, so we will be doing that instead.
+> experience we need across platforms for this lesson, so we will be doing that instead.
 >
 {: .callout}