add more comments #1315

Job	Run time
windows-vc17 (x64)	12m 38s
linux-shared-libs	11m 38s
windows	12m 24s
clang-sanitizers (,address,undefined)	12m 22s
windows-vc17 (x86)	11m 48s
clang-sanitizers (,thread)	12m 27s
windows-shared-libs	12m 22s
downstream	12m 30s
macos-x64	14m 13s
windows-app-verifier	15m 16s
linux-compat (manylinux2014-x64)	12m 32s
macos (dispatch_queue)	13m 18s
macos (kqueue)	13m 30s
linux-compat (fedora-34-x64)	11m 18s
linux-compat (al2-x64)	11m 47s
linux-compat (rhel8-x64)	11m 56s
linux-compat (manylinux2014-x86)	12m 1s
linux-compat (manylinux1-x64)	11m 32s
linux-compat (manylinux1-x86)	11m 50s
linux-compiler-compat (clang-8)	14m 53s
linux-compiler-compat (clang-10)	12m 29s
linux-compiler-compat (gcc-6)	11m 42s
linux-compiler-compat (clang-6)	12m 34s
linux-compiler-compat (gcc-8)	12m 22s
linux-compiler-compat (gcc-5)	11m 45s
linux-compiler-compat (gcc-11)	12m 21s
linux-compiler-compat (clang-11)	12m 36s
linux-compiler-compat (clang-9)	12m 55s
linux-compiler-compat (clang-17)	13m 29s
linux-compiler-compat (clang-15)	12m 51s
linux-compiler-compat (gcc-7)	11m 37s
linux-compiler-compat (gcc-4.8)	13m 40s
linux-compat (opensuse-leap)	12m 31s
	6h 55m 7s

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