minor fixes

Author: iliakan

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

@@ -254,7 +254,7 @@ To put it clear: `typeof` is an operator, not a function. The parentheses here a
 
 Usually, such parentheses contain a mathematical expression, such as `(2 + 2)`, but here they contain only one argument `(x)`. Syntactically, they allow to avoid a space between the `typeof` operator and its argument, and some people like it.
 
-So, some people prefer `typeof(x)`, although the `typeof x` syntax is much more common.
+Some people prefer `typeof(x)`, although the `typeof x` syntax is much more common.
 ```
 
 ## Summary