[`perflint`] Improve docs for `try-except-in-loop` (`PERF203`) #32028

Job	Run time
mkdocs	2m 34s
cargo fmt	17s
pre-commit	31s
Determine changes	10s
python package	1m 12s
cargo clippy	1m 45s
benchmarks	5m 19s
cargo build (msrv)	3m 21s
cargo build (release)	4m 28s
cargo fuzz	4m 10s
cargo shear	27s
cargo test (linux)	4m 0s
cargo test (wasm)	1m 37s
cargo test (windows)	8m 4s
test scripts	1m 0s
formatter instabilities and black similarity	0s
test ruff-lsp	16s
ecosystem	8m 49s
Fuzz the parser	0s
	48m 0s

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