chore: add some progress info to scripts/mkdoc.sh #1837

Job	Run time
Build wheels on Linux (aarch64/manylinux)	10m 19s
Build wheels on Linux (x86_64)	18m 58s
Build wheels on Linux (aarch64/musllinux)	4m 11s
Build wheels on macOS (x86_64)	12m 59s
Build wheels on macOS (arm64)	6m 24s
Build wheels for WebAssembly	7m 10s
Build sdist and test extra dependencies	3m 4s
Build with sanitizers for debugging purposes	2m 7s
Build wheels on Windows (x64)	24m 1s
Build wheels on Windows (Win32)	12m 59s
Build wheels on Windows (ARM64)	14m 37s
	1h 56m 49s

Provide feedback