Fix documented examples for `unnecessary-subscript-reversal` #19644

Job	Run time
cargo fuzz	6m 16s
cargo fmt	20s
cargo clippy	2m 20s
benchmarks	12m 35s
cargo test (wasm)	1m 38s
Determine changes	9s
cargo udeps	2m 49s
cargo test \| ubuntu-latest	6m 15s
cargo test \| windows-latest	8m 19s
mkdocs	2m 6s
pre-commit	1m 44s
python package	2m 21s
test scripts	1m 12s
Formatter ecosystem and progress checks	0s
ecosystem	5m 57s
	54m 1s

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