Fix typo in pool_conections_test [#1350 state:committed]

Signed-off-by: David Heinemeier Hansson <david@loudthinking.com>

activerecord/test/cases/pooled_connections_test.rb

@@ -77,7 +77,7 @@ def test_pooled_connection_checkout_existing_first
     conn_pool.checkin(conn)
   end
 
-  def test_not_connected_defined_connection_reutnrs_false
+  def test_not_connected_defined_connection_returns_false
     ActiveRecord::Base.establish_connection(@connection)
     assert ! ActiveRecord::Base.connected?
   end