E0392 needs to be updated to new format

[sophiajt]

From:

E0392 needs a span_label, updating it from:

error[E0392]: parameter `T` is never used
  --> src/test/compile-fail/E0392.rs:11:10
   |
11 | enum Foo<T> { Bar } //~ ERROR E0392
   |          ^
   |
   = help: consider removing `T` or using a marker such as `std::marker::PhantomData`

To:

error[E0392]: parameter `T` is never used
  --> src/test/compile-fail/E0392.rs:11:10
   |
11 | enum Foo<T> { Bar } //~ ERROR E0392
   |          ^ unused type parameter
   |
   = help: consider removing `T` or using a marker such as `std::marker::PhantomData`

[faebser]

I'm going to work on this

[faebser]

ah okay, my error. @canaltinova is already working on this.