PyLong_FromUnicodeObject document is wrong

[methane]

BPO	41211
Nosy	@methane, @miss-islington
PRs	bpo-41211: Doc: Fix PyLong_FromUnicodeObject #21325 [3.9] bpo-41211: Doc: Fix PyLong_FromUnicodeObject (GH-21325) #21328 [3.8] bpo-41211: Doc: Fix PyLong_FromUnicodeObject (GH-21325) #21329 [3.9] bpo-41211: Doc: Fix PyLong_FromUnicode #21331 [3.8] bpo-41211: Doc: Fix PyLong_FromUnicode (GH-21331) #21332

^{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 = None
closed_at = <Date 2020-07-05.05:38:57.128>
created_at = <Date 2020-07-05.02:53:03.469>
labels = ['3.8', '3.9', '3.10', 'docs']
title = 'PyLong_FromUnicodeObject document is wrong'
updated_at = <Date 2020-07-05.05:38:57.127>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2020-07-05.05:38:57.127>
actor = 'methane'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-07-05.05:38:57.128>
closer = 'methane'
components = ['Documentation']
creation = <Date 2020-07-05.02:53:03.469>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 41211
keywords = ['patch']
message_count = 6.0
messages = ['373009', '373010', '373011', '373012', '373015', '373016']
nosy_count = 3.0
nosy_names = ['methane', 'docs@python', 'miss-islington']
pr_nums = ['21325', '21328', '21329', '21331', '21332']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41211'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[methane]

.. c:function:: PyObject* PyLong_FromUnicodeObject(PyObject *u, int base)

   Convert a sequence of Unicode digits in the string *u* to a Python integer
   value.  The Unicode string is first encoded to a byte string using
   :c:func:`PyUnicode_EncodeDecimal` and then converted using
   :c:func:`PyLong_FromString`.

PyUnicode_EncodeDecimal is not used actually.
It uses private and undocumented _PyUnicode_TransformDecimalAndSpaceToASCII function instead.

The document of PyFloat_FromString() doesn't mention about how it convert unicode string to digits. Let's remove the second sentence.

[methane]

New changeset 9c84417 by Inada Naoki in branch 'master':
bpo-41211: Doc: Fix PyLong_FromUnicodeObject (GH-21325)
9c84417

[miss-islington]

New changeset 48f388f by Miss Islington (bot) in branch '3.9':
bpo-41211: Doc: Fix PyLong_FromUnicodeObject (GH-21325)
48f388f

[miss-islington]

New changeset 4874e59 by Miss Islington (bot) in branch '3.8':
bpo-41211: Doc: Fix PyLong_FromUnicodeObject (GH-21325)
4874e59

[methane]

New changeset 16f4517 by Inada Naoki in branch '3.9':
bpo-41211: Doc: Fix PyLong_FromUnicode (GH-21331)
16f4517