minor fixes

Author: iliakan

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

@@ -257,7 +257,7 @@ There are 8 basic data types in JavaScript.
 
 - `number` for numbers of any kind: integer or floating-point, integers are limited by ±2<sup>53</sup>.
 - `bigint` is for integer numbers of arbitrary length.
-- `string` for strings. A string may have one or more characters, there's no separate single-character type.
+- `string` for strings. A string may have zero or more characters, there's no separate single-character type.
 - `boolean` for `true`/`false`.
 - `null` for unknown values -- a standalone type that has a single value `null`.
 - `undefined` for unassigned values -- a standalone type that has a single value `undefined`.