update format() documentation and tutorial

[grooverdan]

BPO	6813
Nosy	@birkenfeld, @ericvsmith
Files	documentation-str-format.patch: documentation and tutorial updates for format()

^{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 2009-09-01.07:43:05.479>
created_at = <Date 2009-09-01.04:05:04.998>
labels = ['docs']
title = 'update format() documentation and tutorial'
updated_at = <Date 2009-09-01.08:51:58.561>
user = 'https://bugs.python.org/grooverdan'

bugs.python.org fields:

activity = <Date 2009-09-01.08:51:58.561>
actor = 'eric.smith'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-09-01.07:43:05.479>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2009-09-01.04:05:04.998>
creator = 'grooverdan'
dependencies = []
files = ['14812']
hgrepos = []
issue_num = 6813
keywords = ['patch']
message_count = 4.0
messages = ['92119', '92122', '92135', '92136']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'eric.smith', 'grooverdan']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue6813'
versions = ['Python 3.1', 'Python 3.2']

[grooverdan]

Release notes show the use of '{}'.format('this') and the attached patch
updates this to be the default example in the tutorial. Library
references are updated to show field_name as optional and a few examples
are added.

Relates to the improvements from bpo-5237.

[birkenfeld]

Thanks, committed as r74614 (trunk), r74615 (3k).

[ericvsmith]

2.7 does not support the !a conversion specifier. It's only available in
3.1 and above.

It's because ascii() is a 3.x only builtin.

[ericvsmith]

Never mind, I see that you didn't add the !a docs to trunk.