Rollup merge of #74601 - GuillaumeGomez:cleanup-e0724, r=jyn514

Clean up E0724 explanation

r? @Dylan-DPC
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Yuki Okushi 2020-07-24 18:56:29 +09:00 committed by GitHub
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@ -1,4 +1,5 @@
`#[ffi_returns_twice]` was used on non-foreign function.
`#[ffi_returns_twice]` was used on something other than a foreign function
declaration.
Erroneous code example: