opaque-debug: fix typo in example code (#1139) #745

Job	Run time
build (1.60.0, armv7a-none-eabi)	1m 51s
build (1.60.0, thumbv7em-none-eabi)	1m 53s
build (1.60.0, wasm32-unknown-unknown)	1m 51s
build (stable, armv7a-none-eabi)	8s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	19s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 23s
cross (aarch64-unknown-linux-gnu, stable)	32s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 26s
cross (powerpc-unknown-linux-gnu, stable)	32s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	2m 11s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	25s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	25s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	1m 57s
x86 (x86_64-unknown-linux-gnu, stable)	14s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	7s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 48s
test (x86_64-apple-darwin, macos-latest, stable)	13s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 25s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 15s
minimal-versions / minimal-versions	48s
	23m 51s

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