Rollup merge of #73918 - GuillaumeGomez:cleanup-e0715, r=Dylan-DPC

Clean up E0715 explanation

r? @Dylan-DPC
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Manish Goregaokar 2020-07-15 11:01:08 -07:00 committed by GitHub
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@ -15,8 +15,7 @@ struct OverrideConst;
impl Marker for OverrideConst { // error!
const N: usize = 1;
}
fn main() {}
# fn main() {}
```
Because marker traits are allowed to have multiple implementations for the same