Merge pull request javascript-tutorial#3255 from alagunoff/patch-1

Update article.md

1-js/02-first-steps/05-types/article.md

@@ -224,7 +224,7 @@ The `symbol` type is used to create unique identifiers for objects. We have to m
 
 ## The typeof operator [#type-typeof]
 
-The `typeof` operator returns the type of the argument. It's useful when we want to process values of different types differently or just want to do a quick check.
+The `typeof` operator returns the type of the operand. It's useful when we want to process values of different types differently or just want to do a quick check.
 
 A call to `typeof x` returns a string with the type name: