Fix typo

Author: rafaelfranca

activerecord/lib/active_record/connection_adapters/abstract/transaction.rb

@@ -336,7 +336,7 @@ def within_new_transaction(isolation: nil, joinable: true)
             elsif Thread.current.status == "aborting" || (!completed && transaction.written)
               # The transaction is still open but the block returned earlier.
               #
-              # The block could return early because of a timeout or becase the thread is aborting,
+              # The block could return early because of a timeout or because the thread is aborting,
               # so we are rolling back to make sure the timeout didn't caused the transaction to be
               # committed incompletely.
               rollback_transaction