[docs] PEP8 conformance regarding the "Idioms and Anti-Idioms in Python" page

[Matthew Lakier]

This is nothing major, but I guess every bit helps.

Under the "Using Backslash to Continue Statements" section of
http://docs.python.org/2/howto/doanddont.html (also in the Python 3 docs),
the last two code samples:

value = foo.bar()['first'][0]*baz.quux(1, 2)[5:9] \
        + calculate_number(10, 20)*forbulate(500, 360)

and

value = (foo.bar()['first'][0]*baz.quux(1, 2)[5:9]
        + calculate_number(10, 20)*forbulate(500, 360))

have the operator after the line break instead of before, like:

value = (foo.bar()['first'][0]*baz.quux(1, 2)[5:9] +
         calculate_number(10, 20)*forbulate(500, 360))

It would be good if these code samples could be changed to have the
operator before the line break in order to conform with PEP8 ("The
preferred place to break around a binary operator is after the operator,
not before it.") and the rest of the documentation.

Thanks!
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