Correct some bitrot; some things have become inaccurate in the tutorial.

<file>.readlines() does not call <file>.readline() internally anymore,
and the sizehint parameter should be mentioned briefly.

Some displays of floating point numbers needed to be updated due to the
change in the repr() of floats (from 1.6).

Both issues were noted by Aahz <aahz@panix.com>.
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