fix(curriculum): Remove root relative path from action URL in example (#45203)

curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.md

@@ -13,7 +13,7 @@ You can build web forms that actually submit data to a server using nothing more
 For example:
 
 ```html
-<form action="/url-where-you-want-to-submit-form-data">
+<form action="url-where-you-want-to-submit-form-data">
   <input>
 </form>
 ```