Rollup merge of - GuillaumeGomez:cleanup-e0463, r=Dylan-DPC

Clean up E0463 explanation

r? @Dylan-DPC
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Dylan DPC 2020-03-27 15:09:59 +01:00 committed by GitHub
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@ -1,4 +1,6 @@
A plugin/crate was declared but cannot be found. Erroneous code example:
A plugin/crate was declared but cannot be found.
Erroneous code example:
```compile_fail,E0463
#![feature(plugin)]