repetition in transpipe documentation (#1700)

Fixed repetition in the _Watch keys for changes_ chapter

Author: therealtoma

content/develop/clients/redis-py/transpipe.md

@@ -59,7 +59,7 @@ pipe = r.pipeline(transaction=False)
 
 Redis supports *optimistic locking* to avoid inconsistent updates
 to different keys. The basic idea is to watch for changes to any
-keys that you use in a transaction while you are are processing the
+keys that you use in a transaction while you are processing the
 updates. If the watched keys do change, you must restart the updates
 with the latest data from the keys. See
 [Transactions]({{< relref "/develop/interact/transactions" >}})