Update documentation for missing PyDateTime macros

[drougge]

BPO	46201
Nosy	@drougge

^{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 = None
created_at = <Date 2021-12-30.09:30:15.837>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.11', '3.7', 'docs']
title = 'PEP 495 misnames PyDateTime_DATE_GET_FOLD'
updated_at = <Date 2021-12-30.09:30:15.837>
user = 'https://github.com/drougge'

bugs.python.org fields:

activity = <Date 2021-12-30.09:30:15.837>
actor = 'drougge'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-12-30.09:30:15.837>
creator = 'drougge'
dependencies = []
files = []
hgrepos = []
issue_num = 46201
keywords = []
message_count = 1.0
messages = ['409354']
nosy_count = 2.0
nosy_names = ['drougge', 'docs@python']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46201'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[drougge]

PEP-495 names one of the accessor macros PyDateTime_GET_FOLD but the code names it PyDateTime_DATE_GET_FOLD.

The FOLD macros are also missing from https://docs.python.org/3/c-api/datetime.html (and versions).