Rollup merge of #70649 - GuillaumeGomez:cleanup-e0468, r=Dylan-DPC

clean up E0468 explanation

r? @Dylan-DPC
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@ -1,4 +1,4 @@
A non-root module attempts to import macros from another crate.
A non-root module tried to import macros from another crate.
Example of erroneous code:
@ -17,7 +17,7 @@ Either move the macro import to crate root or do without the foreign macros.
This will work:
```
#[macro_use(debug_assert)]
#[macro_use(debug_assert)] // ok!
extern crate core;
mod foo {