fix autodocs regression FTBFS

regressed in dffc8c44f9a01aa05ea364ffdc71509d15bc2601 since there is no
test coverage for the `zig std` command yet.

closes #21180
9848318725Andrew Kelley committed on 8/24/2024, 2:23:38 AMparent5dd2bb5
3 files changedLine totals unavailable