[docs] Format a code snippet. #461

Job	Run time
cmake	58s
aarch64	50s
arenastring-gcc-stdlibc++-default	30s
basic-gcc-dbg-c++20-stdlibc++-asan	35s
arenastring-gcc-stdlibc++-half	30s
coverage	52s
basic-gcc-dbg-c++20-stdlibc++-tsan	38s
cpp14-coroutine	31s
arenastring-gcc-stdlibc++-full	31s
basic-gcc-dbg-c++14-stdlibc++-asan	39s
arenastring-clang-stdlibc++-default	30s
workspace	27s
basic-gcc-opt-c++20-stdlibc++-asan	35s
arenastring-clang-libc++-default	40s
basic-gcc-opt-c++20-stdlibc++-tsan	40s
basic-gcc-opt-c++14-stdlibc++-asan	27s
basic-clang-dbg-c++20-stdlibc++-asan	34s
basic-clang-dbg-c++20-stdlibc++-tsan	42s
basic-clang-dbg-c++20-libc++-asan	50s
basic-clang-dbg-c++20-libc++-tsan	42s
basic-clang-dbg-c++14-stdlibc++-asan	45s
basic-clang-dbg-c++14-libc++-asan	55s
basic-clang-opt-c++20-stdlibc++-asan	42s
basic-clang-opt-c++20-stdlibc++-tsan	40s
basic-clang-opt-c++20-libc++-asan	1m 14s
basic-clang-opt-c++20-libc++-tsan	36s
basic-clang-opt-c++14-stdlibc++-asan	32s
basic-clang-opt-c++14-libc++-asan	1m 9s
	19m 14s

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