Changed "statement" to "expression" (#39564)

The ternary operator doesn't allow statements, just expressions.

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-conditional-ternary-operator.english.md

@@ -9,7 +9,7 @@ forumTopicId: 301181
 <section id='description'>
 The <dfn>conditional operator</dfn>, also called the <dfn>ternary operator</dfn>, can be used as a one line if-else expression.
 The syntax is:
-<code>condition ? statement-if-true : statement-if-false;</code>
+<code>condition ? expression-if-true : expression-if-false;</code>
 The following function uses an if-else statement to check a condition:
 
 ```js