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E0375 needs to be updated to new format #35635

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@sophiajt

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@sophiajt

From: src/test/compile-fail/E0375.rs

E0375 needs a span_label, an updated title, and a note, changing it from:

error[E0375]: the trait `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced, but 2 fields need coercions: b (T to U), c (U to T)
  --> src/test/compile-fail/E0375.rs:20:1
   |
20 | impl<T, U> CoerceUnsized<Foo<U, T>> for Foo<T, U> {} //~ ERROR E0375
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

To:

error[E0375]: implementing the trait `CoerceUnsized` requires multiple coercions
  --> src/test/compile-fail/E0375.rs:20:1
   |
20 | impl<T, U> CoerceUnsized<Foo<U, T>> for Foo<T, U> {} //~ ERROR E0375
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires multiple coercions
   |
   = note: `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced
   = note: currently, 2 fields need coercions: b (T to U), c (U to T)

Bonus: Underline CoerceUnsized<Foo<U, T>> (or, alternately Foo<T, U>)

error[E0375]: implementing the trait `CoerceUnsized` requires multiple coercions
  --> src/test/compile-fail/E0375.rs:20:1
   |
20 | impl<T, U> CoerceUnsized<Foo<U, T>> for Foo<T, U> {} //~ ERROR E0375
   |            ^^^^^^^^^^^^^^^^^^^^^^^^ requires multiple coercions
   |
   = note: `CoerceUnsized` may only be implemented for a coercion between structures with one field being coerced
   = note: currently, 2 fields need coercions: b (T to U), c (U to T)

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