docs(typedoc): document function examples

src/functions/classNames.ts

@@ -20,6 +20,14 @@
 /**
  * Conditionally joins given class strings
  *
+ * @example
+ * ```ts
+ * let isVisible = false
+ *
+ * // prints "bg-blue-300 hidden"
+ * console.log(classNames("bg-blue-300", isVisible ? "block" : "hidden"))
+ * ```
+ *
  * @param classes - class strings to join
  * @returns new string
  */