[docs update]并发部分图片修复

Author: Snailclimb

docs/java/concurrent/images/jmm/cpu-cache-protocol.drawio

@@ -1 +1 @@
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docs/java/concurrent/images/jmm/cpu-cache-protocol.jpg

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docs/java/concurrent/images/jmm/cpu-cache.drawio

@@ -481,7 +481,7 @@ ThreadLocalMap(ThreadLocal<?> firstKey, Object firstValue) {
 
 `ThreadLocal` 数据结构如下图所示：
 
-![threadlocal-data-structure](images/interview-questions/threadlocal-data-structure.jpg)
+![threadlocal-data-structure](./images/interview-questions/threadlocal-data-structure.jpg)
 
 `ThreadLocalMap`是`ThreadLocal`的静态内部类。
 

docs/java/concurrent/images/jmm/cpu-cache.jpg

@@ -24,7 +24,7 @@ head:
 
 为了更好地理解，我画了一个简单的 CPU Cache 示意图如下（实际上，现代的 CPU Cache 通常分为三层，分别叫 L1,L2,L3 Cache）:
 
-![CPU 缓存模型示意图](./images/jmm/cpu-cache.png)
+![CPU 缓存模型示意图](./images/jmm/cpu-cache.jpg)
 
 **CPU Cache 的工作方式：** 先复制一份数据到 CPU Cache 中，当 CPU 需要用到的时候就可以直接从 CPU Cache 中读取数据，当运算完成后，再将运算得到的数据写回 Main Memory 中。但是，这样存在 **内存缓存不一致性的问题** ！比如我执行一个 i++操作的话，如果两个线程同时执行的话，假设两个线程从 CPU Cache 中读取的 i=1，两个线程做了 1++运算完之后再写回 Main Memory 之后 i=2，而正确结果应该是 i=3。
 
@@ -38,7 +38,7 @@ head:
 
 ## 指令重排序
 
-说完了 CPU 缓存模型，我们再来看看另外一个比较重要的概念 **指令重排序** ，这同样
+说完了 CPU 缓存模型，我们再来看看另外一个比较重要的概念 **指令重排序** 。
 
 为了提升执行速度/性能，计算机在执行程序代码的时候，会对指令进行重排序。