[site] add description for extra-args.md #5508

Job	Run time
Build and test (ubuntu-latest, 1.81)	5m 7s
Build and test (ubuntu-latest, stable)	3m 51s
Build and test (macos-14, 1.81)	4m 23s
Build documentation (ubuntu-latest)	1m 15s
Build and test (macos-14, stable)	2m 56s
Build and test (windows-latest, 1.81)	8m 15s
Build and test (windows-latest, stable)	7m 50s
Lint (ubuntu-latest)	42s
Lint (windows-latest)	3m 26s
Test archives with a target runner	2m 10s
Test archives with a runner (destination) (ubuntu-24.04, ubuntu-latest)	6s
Test archives with a runner (destination) (windows-latest, windows-latest)	23s
	40m 24s

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