[docs] [issue34161] (good first issue) Tutorial 7.1 str.format() code example syntax error

[Aaqa Ishtyaq]

Change by Aaqa Ishtyaq <aaqaishtyaq at gmail.com>:


----------
pull_requests: +7885

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34161>
_______________________________________