Possible error in documentation, in defer.html

[roup]

- Page:  http://twistedmatrix.com/projects/core/documentation/howto/defer.html

- Section: Multiple callbacks

The example ends with::

# this series of callbacks and errbacks will print "Result: 12" g = Getter() d = g.getData(4) d.addCallback(printData) d.addErrback(printError)

The line::

d = g.getData(4)

should be::

d = g.getDummyData(4)

[exarkun]

(In [19047]) Apply fix for Deferred documentation bug

Author: roup Reviewer: exarkun Fixes #2306

Replace erroneous "getData" call with a call to the function actually defined in the documentation, "getDummyData".