Fix comment typo, and remove double space.

src/ZEO/StorageServer.py

@@ -610,7 +610,7 @@ class StorageServer:
             speed client cache verification when a client disconnects
             for a short period of time.
 
-        transaction_timout -- The maximum amount of time to wait for
+        transaction_timeout -- The maximum amount of time to wait for
             a transaction to commit after acquiring the storage lock.
             If the transaction takes too long, the client connection
             will be closed and the transaction aborted.