Update src/plugin-slots/CourseFilesSlot/README.md

Co-authored-by: Braden MacDonald <[email protected]>

Author: xitij2000

src/plugin-slots/CourseFilesSlot/README.md

@@ -11,7 +11,7 @@ This slot is used to replace/modify/hide the course file table UI.
 ### Wrapped with a div with dashed border
 ![Red Border around Files UI](./screenshot_files_border_wrap.png)
 
-The following `env.config.jsx` will wrap the files component with a div that has a large red dashed 
+The following `env.config.jsx` will wrap the files component with a div that has a large dashed 
 red border.
 
 ```js