doc: updated built-in help of scripts/mkdoc.sh #1849

Job	Run time
Build wheels on Linux (x86_64)	19m 38s
Build wheels on Linux (aarch64/manylinux)	9m 44s
Build wheels on Linux (aarch64/musllinux)	4m 8s
Build wheels for WebAssembly	6m 29s
Build sdist and test extra dependencies	3m 30s
Build with sanitizers for debugging purposes	3m 16s
Build wheels on Windows (x64)	25m 20s
Build wheels on Windows (ARM64)	15m 1s
Build wheels on Windows (Win32)	13m 4s
Build wheels on macOS (x86_64)	16m 37s
Build wheels on macOS (arm64)	7m 44s
	2h 4m 31s

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