Fix dict's __missing__ documentation

[bharel]

BPO	39267
Nosy	@bharel
PRs	gh-83448: Fix dict's __missing__ documentation #17911

^{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 2020-01-09.00:06:07.993>
labels = ['3.8', 'type-feature', '3.7', '3.9', 'docs']
title = "Fix dict's __missing__ documentation"
updated_at = <Date 2020-01-09.00:12:16.159>
user = 'https://github.com/bharel'

bugs.python.org fields:

activity = <Date 2020-01-09.00:12:16.159>
actor = 'bar.harel'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-01-09.00:06:07.993>
creator = 'bar.harel'
dependencies = []
files = []
hgrepos = []
issue_num = 39267
keywords = ['patch']
message_count = 1.0
messages = ['359639']
nosy_count = 2.0
nosy_names = ['docs@python', 'bar.harel']
pr_nums = ['17911']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39267'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[bharel]

Continuing bpo-39264, and according to the mailing list discussion at Python-Dev.
Fixing dict's __missing__ documentation. Clarify .get() does not call __missing__, and move __missing__ from the data model to dict's section as it's not a general object or ABC method but a dict-only implementation.