[ThreadPool] Fix docs to match new API

[email protected]

Bug: 1026641
Change-Id: I68c6e40f080ac5808cd9c67e227695ca921e1691
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026714
Auto-Submit: Gabriel Charette <[email protected]>
Commit-Queue: Etienne Pierre-Doray <[email protected]>
Reviewed-by: Etienne Pierre-Doray <[email protected]>
Cr-Commit-Position: refs/heads/master@{#736281}
diff --git a/docs/threading_and_tasks.md b/docs/threading_and_tasks.md
index 998e5251..f483d44 100644
--- a/docs/threading_and_tasks.md
+++ b/docs/threading_and_tasks.md
@@ -654,8 +654,7 @@
 // Returns the latest thread-safe number of incomplete work items.
 void NumIncompleteWorkItems();
 
-base::PostJob(FROM_HERE,
-              {base::ThreadPool()},
+base::PostJob(FROM_HERE, {},
               base::BindRepeating(&WorkerTask),
               base::BindRepeating(&NumIncompleteWorkItems));
 ```