LastUpdatedOrderedDict recipe uses super() unnecessarily

[wimglenn]

BPO	36909
Nosy	@rhettinger, @wimglenn
PRs	bpo-36909 Simplify the LastUpdatedOrderedDict example recipe #13296

^{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 2019-05-14.02:43:00.558>
created_at = <Date 2019-05-13.22:21:50.579>
labels = ['docs']
title = 'LastUpdatedOrderedDict recipe uses super() unnecessarily'
updated_at = <Date 2019-05-14.02:43:00.557>
user = 'https://github.com/wimglenn'

bugs.python.org fields:

activity = <Date 2019-05-14.02:43:00.557>
actor = 'rhettinger'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-05-14.02:43:00.558>
closer = 'rhettinger'
components = ['Documentation']
creation = <Date 2019-05-13.22:21:50.579>
creator = 'wim.glenn'
dependencies = []
files = []
hgrepos = []
issue_num = 36909
keywords = []
message_count = 1.0
messages = ['342395']
nosy_count = 3.0
nosy_names = ['rhettinger', 'docs@python', 'wim.glenn']
pr_nums = ['13296']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36909'
versions = []

[wimglenn]

Section https://docs.python.org/3/library/collections.html#ordereddict-examples-and-recipes

    class LastUpdatedOrderedDict(OrderedDict):
        'Store items in the order the keys were last added'

        def __setitem__(self, key, value):
            super().__setitem__(key, value)
            super().move_to_end(key)

Why does it use super().move_to_end(key), isn't self.move_to_end(key) more direct/Pythonic?