[issue5621] Add description of special case to "Assignment statements" section

[John Posner]

John Posner <john_posner_ab71 at post.harvard.edu> added the comment:

The "Assignment statements" section *does* talk about the RHS -- but in
a subtle way:

  For targets which are attribute references, the initial
  value is retrieved with a getattr()

The retrieving of the initial value (maybe "current value" would be
better) occurs on the RHS of the assignment statement.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5621>
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