docs: fix Markdown typo

Bug: None
Test: N/A
Change-Id: I0d07bd8396871d61ad4895885b40de0cb91064ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4363878
Reviewed-by: François Degros <[email protected]>
Commit-Queue: François Degros <[email protected]>
Auto-Submit: Nigel Tao <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1120935}
diff --git a/docs/threading_and_tasks.md b/docs/threading_and_tasks.md
index 5ac8269ba..2eae39a7 100644
--- a/docs/threading_and_tasks.md
+++ b/docs/threading_and_tasks.md
@@ -496,12 +496,14 @@
 
 Methods that take `base::TaskTraits` can be be passed `{}` when default traits
 are sufficient. Default traits are appropriate for tasks that:
+
 - Don’t block (ref. MayBlock and WithBaseSyncPrimitives);
 - Pertain to user-blocking activity;
   (explicitly or implicitly by having an ordering dependency with a component
    that does)
 - Can either block shutdown or be skipped on shutdown (thread pool is free to
   choose a fitting default).
+
 Tasks that don’t match this description must be posted with explicit TaskTraits.
 
 [`base/task/task_traits.h`](https://cs.chromium.org/chromium/src/base/task/task_traits.h)