Merge pull request #228 from Hearen/fix-JUL-thread-command

JUL is actually java.util.concurrency.lock

site/src/site/sphinx/en/thread.md

@@ -139,7 +139,7 @@ $ thread -b
     - java.util.concurrent.ThreadPoolExecutor$Worker@31a6493e
 ```
 
-> Attention: only `synchronized` blocked threads can be located for now, `JUL` not supported yet.
+Attention: only `synchronized` blocked threads can be located for now, while `java.util.concurrent.Lock` not supported yet.
 
 
 #### thread -i specify the collecting interval

site/src/site/sphinx/thread.md

@@ -138,7 +138,7 @@ $ thread -b
     - java.util.concurrent.ThreadPoolExecutor$Worker@31a6493e
 ```
 
-> 注意， 目前只支持找出synchronized关键字阻塞住的线程， 如果是JUL的锁， 目前还不支持。
+> 注意， 目前只支持找出synchronized关键字阻塞住的线程， 如果是`java.util.concurrent.Lock`， 目前还不支持。
 
 
 #### thread -i, 指定采样时间间隔
@@ -162,4 +162,4 @@ $ thread -n 3 -i 1000
     Number of locked synchronizers = 1
     - java.util.concurrent.ThreadPoolExecutor$Worker@546aeec1
 ...
-```
+```