docs: fix PLR0124 description to not claim self-comparison always returns the same value

[avasis-ai]

Closes #22160

Summary

PLR0124 documentation previously stated that comparing a name to itself "always results in the same value". This is incorrect because __eq__ can be overridden (e.g., float('nan') == float('nan') returns False).

Updated to match the suggestion in the issue: Comparing a name to itself typically results in a truthy value, and is likely a mistake.

[astral-sh-bot]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+2 -0 violations, +0 -0 fixes in 2 projects; 54 projects unchanged)

binary-husky/gpt_academic (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ shared_utils/nltk_downloader.py:2141:17: B909 Mutation to loop iterable `self._download_msg_queue` during iteration

pytest-dev/pytest (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ scripts/release.py:65:17: B909 Mutation to loop iterable `lines` during iteration

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
B909	2	2	0	0	0