Check that intra-doc links are not broken - #17504

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The issue corrected by this PR made the sync job fail.

r? @flip1995

Any reason not to use cargo doc --workspace --no-deps instead?

We don't use a workspace, so it only builds the root, at least that what it did the last time I tried.

We don't use a workspace, so it only builds the root, at least that what it did the last time I tried.

We should use one though. Maybe the next 3 year thing I tackle once the JOSH sync is done :D

@rustbot merge

Fixed indentation problem which made the conclusion job invalid.