Remove stop() comment since it's not accurate

Summary: Remove stop() comment since it's not accurate

Reviewed By: yfeldblum

Differential Revision: D9600621

fbshipit-source-id: 599551efc775a622d5a5b4a45ead1f3dcbf10abb

folly/executors/CPUThreadPoolExecutor.h

@@ -54,8 +54,6 @@ namespace folly {
  * combination with Lifosem - it almost doesn't matter if more threads than are
  * necessary are specified at startup.
  *
- * @note stop() will finish all outstanding tasks at exit.
- *
  * @note Supports priorities - priorities are implemented as multiple queues -
  * each worker thread checks the highest priority queue first. Threads
  * themselves don't have priorities set, so a series of long running low