Yes, you're right, if the error in the reading were +/- 1, then the maximum error in the titre would be +/- 2. In the question, it just SO HAPPENS that there is no error in the titre, but if you were quoting the result, you would want to write the +/- 2 bit at the end. That there was no error is basically a lucky coincidence.
There's not really a way for you to know which way the errors go in reading off from a burette I'm afraid. That's why you always write the error as (+/-), and this is the reason why you add up (absolutely) the absolute errors when adding/subtracting.