rustdoc: Write doc-comments directly instead of using FromIterator #92082
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The FromIterator impl made the code much harder to understand. The types
don't make sense until you realize there's a custom FromIterator impl.
This is the first commit from #91305; since @camelid wrote it originally I don't feel bad unilaterally approving it.
r? @ghost
@bors r+
Note that this will conflict with #92078.