Fix typo in pub-sub doc.
@@ -218,7 +218,7 @@ class Pub(object):
transfers. For context, most data transfer first checks with the scheduler to find which
workers should participate, and then does direct worker-to-worker
transfers. This checking in with the scheduler provides some stability
- guarnatees, but also adds in a few extra network hops. PubSub doesn't do
+ guarantees, but also adds in a few extra network hops. PubSub doesn't do
this, and so is faster, but also can easily drop messages if Pubs or Subs
disappear without notice.
