nextint -> nextInt (#394)

* 忽路->忽略

* 修复跳转链接错误

* fix Class.getInterface() -> Class.getInterfaces()

* 否者 -> 否则

* 编译期 -> 编译器 ，原文"the compiler will only allow you to say that the superclass reference is “some class that is a superclass of FancyToy” a"

* ierator -> iterator

* nextint -> nextInt

docs/book/19-Type-Information.md

@@ -1171,7 +1171,7 @@ class Part implements Supplier<Part> {
 
     private static Random rand = new Random(47);
     public Part get() {
-        int n = rand.nextint(prototypes.size());
+        int n = rand.nextInt(prototypes.size());
         return prototypes.get(n).get();
     }
 }