[doc] Fix a code example, non declared variable being printed

[AkechiShiro]

BPO	45498
Nosy	@AkechiShiro
PRs	bpo-45498: fix csv dictReader code example #28999
Files	csv-example-fix.patch

^{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 2021-10-16.21:44:44.191>
created_at = <Date 2021-10-16.20:59:22.190>
labels = ['3.7', '3.8', '3.9', '3.10', '3.11', 'type-feature', 'docs']
title = '[doc] Fix a code example, non declared variable being printed'
updated_at = <Date 2021-10-16.21:44:44.191>
user = 'https://github.com/AkechiShiro'

bugs.python.org fields:

activity = <Date 2021-10-16.21:44:44.191>
actor = 'AkechiShiro'
assignee = 'docs@python'
closed = True
closed_date = <Date 2021-10-16.21:44:44.191>
closer = 'AkechiShiro'
components = ['Documentation']
creation = <Date 2021-10-16.20:59:22.190>
creator = 'AkechiShiro'
dependencies = []
files = ['50365']
hgrepos = []
issue_num = 45498
keywords = ['patch']
message_count = 1.0
messages = ['404115']
nosy_count = 2.0
nosy_names = ['docs@python', 'AkechiShiro']
pr_nums = ['28999']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45498'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[AkechiShiro]

I was looking through the documentation at examples for reading CSV files and noticed that an undefined variable was printed in a code example, this affects Python version from 3.6 till 3.110a1 (dev version of the documentation).

It got me kind of confused, because a for loop does not really declare variables.
The fix is really simple, just printing the variable that is declared.