fixes: fixed pointed out

yoshimoto8 · yoshimoto8 · commit c8092fdb828d · 2018-12-05T09:19:47.000+09:00
Since ci failed, it is recommitted and fixed indent num and english grammar.
diff --git a/doc/api/worker_threads.md b/doc/api/worker_threads.md
@@ -235,7 +235,8 @@ added: v10.5.0
 -->
 
 The `Worker` class represents an independent JavaScript execution thread.
-This class inherits from EventEmitter, and Most Node.js APIs are available inside of it.
+This class inherits from `EventEmitter`, and most Node.js APIs are available
+inside of it.
 
 Notable differences inside a Worker environment are:
 
