Add missing warning doc #1517

Job	Run time
bindings	17m 24s
build (clang-sanitize, ubuntu-22.04)	33m 12s
conan	6m 40s
build (gcc-release, ubuntu-22.04)	7m 50s
linux-coverage	11m 54s
build (gcc-11-release, ubuntu-22.04)	7m 27s
build (gcc-debug-shared, ubuntu-22.04)	6m 42s
build (gcc-debug-noexcept, ubuntu-22.04)	6m 40s
build (macos-release, macos-13)	6m 5s
build (win64-release, windows-latest)	10m 24s
build (win64-debug-shared, windows-latest)	8m 46s
build (win64-debug-noexcept, windows-latest)	7m 0s
	2h 10m 4s

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