Fix typo: 'implementation' #241

Job	Run time
posix (STD=17 JOB=test/x3, boost, clang-18 libc++-18-dev libc++abi-18-dev libunwind-18-dev jq cc...	4m 58s
posix (STD=17 JOB=test/x3, boost, g++-13 jq ccache, ubuntu-22.04, gcc-13, 17, test/x3, gcc-13)	4m 13s
posix (STD=11 JOB=test/qi, boost, clang-14 libc++-14-dev libc++abi-14-dev libunwind-14-dev jq cc...	8m 11s
posix (STD=11 JOB=test/karma, boost, clang-14 libc++-14-dev libc++abi-14-dev libunwind-14-dev jq...	7m 45s
posix (STD=11 JOB=test/lex, boost, clang-14 libc++-14-dev libc++abi-14-dev libunwind-14-dev jq c...	6m 4s
posix (STD=11 JOB=test/support, boost, clang-14 libc++-14-dev libc++abi-14-dev libunwind-14-dev ...	2m 26s
posix (STD=11 JOB=repository/test, boost, clang-14 libc++-14-dev libc++abi-14-dev libunwind-14-d...	2m 41s
posix (STD=11 JOB=test/qi, boost, g++-11 jq ccache, ubuntu-22.04, gcc-11, 11, test/qi, gcc-11)	7m 42s
posix (STD=11 JOB=test/karma, boost, g++-11 jq ccache, ubuntu-22.04, gcc-11, 11, test/karma, gcc...	6m 43s
posix (STD=11 JOB=test/lex, boost, g++-11 jq ccache, ubuntu-22.04, gcc-11, 11, test/lex, gcc-11)	5m 6s
posix (STD=11 JOB=test/support, boost, g++-11 jq ccache, ubuntu-22.04, gcc-11, 11, test/support,...	2m 6s
posix (STD=11 JOB=repository/test, boost, g++-11 jq ccache, ubuntu-22.04, gcc-11, 11, repository...	2m 21s
	1h 0m 16s

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