ZODB.org corrections

[Richard Mitchell]

http://www.zodb.org/documentation/articles/ZODB-overview.html#transactions

"On solution is" = "One solution is"

"Scalability Python is limited to a single CPU by the Global Interpreter Lock"
"Scalability" should be a heading.

http://www.zodb.org/documentation/articles/ZODB1.html

The link to StandaloneZODB is broken

"""
    def addTask(self, task):
        self.task.append(task)
"""
should be "self.tasks.append"

http://www.zodb.org/documentation/articles/ZODB2.html

"Voalitile Data" = "Volatile Data"

"the other thread will retry a few seconds later" Really? Seconds?