Add comments #3126

Job	Run time
clang-sanitizers (,thread)	18m 11s
linux-compiler-compat (clang-3)	16m 43s
clang-sanitizers (,address,undefined)	16m 45s
linux-compiler-compat (clang-6)	17m 26s
linux-compiler-compat (clang-8)	16m 41s
linux-compiler-compat (clang-9)	17m 27s
linux-compiler-compat (clang-10)	16m 49s
linux-compiler-compat (clang-11)	17m 25s
linux-shared-libs	16m 29s
linux-compat (manylinux1-x64)	15m 13s
linux-compiler-compat (gcc-4.8)	15m 28s
linux-compat (manylinux1-x86)	15m 33s
linux-compiler-compat (gcc-5)	15m 59s
linux-compat (manylinux2014-x64)	16m 25s
linux-compiler-compat (gcc-6)	16m 9s
linux-compat (manylinux2014-x86)	16m 31s
linux-compiler-compat (gcc-7)	16m 26s
linux-compat (al2-x64)	15m 15s
linux-compiler-compat (gcc-8)	17m 7s
byo-crypto	2m 31s
downstream	20m 15s
linux-debug	16m 40s
osx	19m 13s
windows	16m 26s
windows-app-verifier	29m 11s
windows-shared-libs	15m 48s
windows-vc14 (x86)	16m 35s
windows-vc14 (x64)	16m 33s
	7h 47m 14s

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