fix: typo

example/main.go

@@ -82,7 +82,7 @@ func main() {
 	m, _ := config.Get("map").Map() // return conf.Map and error if any
 	fmt.Printf("%T, %v\n", m, m)    // conf.Map, map[a:1 b:2 c:3]
 
-	// key "a" can be interpreted as int
+	// key "с" can be interpreted as int
 	x, _ := m.Get("c").Int()
 	fmt.Println(x) // prints 3
 }