Update article.md

Author: Zearin

2-ui/4-forms-controls/1-form-elements/article.md

@@ -289,9 +289,9 @@ Form navigation:
 `element.form`
 : Elements reference their form in the `form` property.
 
-Value is available as `input.value`, `textarea.value`, `select.value`, etc. (or `input.checked` for checkboxes and radio buttons).
+Value is available as `input.value`, `textarea.value`, `select.value`, etc. (For checkboxes and radio buttons, use `input.checked` to determine whether a value is selected.)
 
-For `<select>`, we can also get the value by the index `select.selectedIndex` or through the options collection `select.options`.
+For `<select>`, one can also get the value by the index `select.selectedIndex` or through the options collection `select.options`.
 
 These are the basics to start working with forms. We'll meet many examples further in the tutorial.