Correct typos in error messages.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2179 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/storage/database/manager.py

@@ -35,7 +35,7 @@ class DatabaseManager(object):
             Begin a transaction
         """
         if self._under_transaction:
-            raise DatabaseFailure('A transaction as already began')
+            raise DatabaseFailure('A transaction has already begun')
         self._begin()
         self._under_transaction = True
 
@@ -44,7 +44,7 @@ class DatabaseManager(object):
             Commit the current transaction
         """
         if not self._under_transaction:
-            raise DatabaseFailure('The transaction as not began')
+            raise DatabaseFailure('The transaction has not begun')
         self._commit()
         self._under_transaction = False