Rephrasing the doc of object.__nonzero__

[ezio-melotti]

BPO	5493
Nosy	@birkenfeld, @ezio-melotti

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/birkenfeld'
closed_at = <Date 2009-03-15.21:45:03.609>
created_at = <Date 2009-03-15.13:21:22.952>
labels = ['docs']
title = 'Rephrasing the doc of object.__nonzero__'
updated_at = <Date 2009-03-15.21:45:03.608>
user = 'https://github.com/ezio-melotti'

bugs.python.org fields:

activity = <Date 2009-03-15.21:45:03.608>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-03-15.21:45:03.609>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2009-03-15.13:21:22.952>
creator = 'ezio.melotti'
dependencies = []
files = []
hgrepos = []
issue_num = 5493
keywords = []
message_count = 2.0
messages = ['83630', '83642']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'ezio.melotti']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue5493'
versions = []

[ezio-melotti]

The doc 1 actually says:
object.__nonzero__(self)
Called to implement truth value testing, and the built-in operation
bool(); should return False or True, or their integer equivalents 0 or

1. When this method is not defined, __len__() is called, if it is
   defined (see below). If a class defines neither __len__() nor
   __nonzero__(), all its instances are considered true.

I suggest to:

1. drop the comma after 'testing';
2. clarify what happens when __nonzero__ is defined and where 'below'
   actually is (and possibly add a link).

[birkenfeld]

Thanks, fixed in r70387.