Provide a better error message for broken links in mdbook-spec #1716
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This improves the error message when there is a broken link. I was relying on
rustdoc::broken_intra_doc_links
to generate a good message, but that doesn't seem to fire if there is a space in the link text. Thus, if you have something like[foo bar]
which doesn't have a definition, you would get a confusing error message that just spits out a meaningless byte range.