Refine the README

Author: jepler

README.md

@@ -6,11 +6,9 @@ SPDX-License-Identifier: MIT
 
 This folder contains scripts that can be run to create requirement screenshots for all of the learn guide projects
 
-To use the scripts you must set `LEARN_GUIDE_REPO` inside of `get_imports.py` to point to the location of learn guide repo.
+To use the scripts you must set the environment `LEARN_GUIDE_REPO` to point to the location of learn guide repo.  It must end with a trailing slash.
 
-default value is `"../Adafruit_Learning_System_Guides/"`
-
-One directory above the root of this repo.
+The default value is `"../Adafruit_Learning_System_Guides/"`, one directory above the root of this repo.
 
 With that pointed at a learn guide repo you can run: