[docs] fix formatting of "See Style Guide" link (#17272)

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## Summary

Minor formatting tweak in the docs. Looks like the link is meant to be
italic (others "See XXXX" are), but the opening underscore isn't closed
so it's displayed in the rendered version:
https://docs.astral.sh/ruff/formatter/#philosophy


![image](https://github.com/user-attachments/assets/e5984a90-3ea6-4afc-a561-2c681519c78d)


## Test Plan

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Bruno Alla 2025-04-07 13:43:26 +01:00 committed by GitHub
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@ -33,7 +33,7 @@ adoption is minimally disruptive for the vast majority of projects.
Specifically, the formatter is intended to emit near-identical output when run over existing Specifically, the formatter is intended to emit near-identical output when run over existing
Black-formatted code. When run over extensive Black-formatted projects like Django and Zulip, > 99.9% Black-formatted code. When run over extensive Black-formatted projects like Django and Zulip, > 99.9%
of lines are formatted identically. (See: [_Style Guide](#style-guide).) of lines are formatted identically. (See: [_Style Guide_](#style-guide).)
Given this focus on Black compatibility, the formatter thus adheres to [Black's (stable) code style](https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html), Given this focus on Black compatibility, the formatter thus adheres to [Black's (stable) code style](https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html),
which aims for "consistency, generality, readability and reducing git diffs". To give you a sense which aims for "consistency, generality, readability and reducing git diffs". To give you a sense