reachable computation: extend explanation of what this does, and why #123540

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Job	Run time
Calculate job matrix	12s
PR - mingw-check	25m 53s
PR - mingw-check-tidy	4m 41s
PR - x86_64-gnu-llvm-17	50m 29s
PR - x86_64-gnu-tools	44m 25s
bors build finished	0s
	2h 5m 40s