Changed a checked box to a small letter "x"

Author: MattCarolus10

Form-Controls/README.md

@@ -46,7 +46,7 @@ Let's write out our testable criteria. Check each one off as you complete it.
 
 - [x] My form is semantic HTML.
 - [x] All inputs have associated labels.
-- [X] My Lighthouse Accessibility score is 100.
+- [x] My Lighthouse Accessibility score is 100.
 - [x] I require a valid name. 
 - [x] I require a valid email.
 - [x] I require one colour from a defined set of 3 colours.