Rollup merge of #75360 - pickfire:patch-4, r=GuillaumeGomez

Add sample fix for E0749

Even though the description is clear but the solution may not be as straightforward.
Adding a suggested fix from documentation side.

r? @GuillaumeGomez

However, this suggestion should be shown in rustc itself for easy fix, the documentation should also reflect on the changes in rustc. Currently,
```
error[E0749]: negative impls cannot have any items
 --> test.rs:6:5
  |
6 |     type Foo = i32; // error!
  |     ^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0749`.
```
rustc should tell the user to remove it.

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