Missing alias utf-8 in Standard Encodings list.

[mintaka]

BPO	6772
Nosy	@malemburg, @birkenfeld

^{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 2009-08-24.07:44:11.952>
created_at = <Date 2009-08-24.07:40:38.066>
labels = ['invalid', 'docs']
title = 'Missing alias  utf-8 in  Standard Encodings list.'
updated_at = <Date 2009-08-24.17:15:02.998>
user = 'https://bugs.python.org/mintaka'

bugs.python.org fields:

activity = <Date 2009-08-24.17:15:02.998>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-08-24.07:44:11.952>
closer = 'lemburg'
components = ['Documentation']
creation = <Date 2009-08-24.07:40:38.066>
creator = 'mintaka'
dependencies = []
files = []
hgrepos = []
issue_num = 6772
keywords = []
message_count = 4.0
messages = ['91904', '91905', '91906', '91926']
nosy_count = 3.0
nosy_names = ['lemburg', 'georg.brandl', 'mintaka']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue6772'
versions = ['Python 3.0']

[mintaka]

On page
http://docs.python.org/dev/3.0/library/codecs.html#standard-encodings
(and on the pages for older versions too)
in the table with review, is missing higly used alias "utf-8"

On that row is only:
Codec Aliases Languages
utf_8 U8, UTF, utf8 all languages
And probably there should be:
utf_8 U8, UTF, utf8, utf-8 all languages

[malemburg]

From the quoted page:

"""
Notice that spelling alternatives that only differ in case or use a
hyphen instead of an underscore are also valid aliases.
"""

[mintaka]

True, but this one is much more used then others. So frequently, that
look like other names are aliases. Maybe it is good reason to mention it
explicitly.

[birkenfeld]

I made a compromise in r74545: 'utf-8' is now used as an example to
demonstrate the statement Marc-Andre cited.