Rollup merge of #47497 - goffrie:patch-1, r=dtolnay
Remove incorrect `Default::default` links, add a new one `map_or` and `map_or_else` don't use `Default::default`, but `unwrap_or_default` does.
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Remove incorrect `Default::default` links, add a new one `map_or` and `map_or_else` don't use `Default::default`, but `unwrap_or_default` does.