E0118 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0118.rs

Error E0118 needs a span_label and a span_note to be a simple note, updating from:

error[E0118]: no base type found for inherent implementation
  --> src/test/compile-fail/E0118.rs:11:1
   |
11 | impl (u8, u8) { //~ ERROR E0118
   | ^
   |
help: either implement a trait on it or create a newtype to wrap it instead
  --> src/test/compile-fail/E0118.rs:11:1
   |
11 | impl (u8, u8) { //~ ERROR E0118
   | ^

To:

error[E0118]: no base type found for inherent implementation
  --> src/test/compile-fail/E0118.rs:11:1
   |
11 | impl (u8, u8) { //~ ERROR E0118
   | ^ impl requires a base type
   |
   = note: either implement a trait on it or create a newtype to wrap it instead

Bonus: It'd be good if we could underline the type it's complaining about.

error[E0118]: no base type found for inherent implementation
  --> src/test/compile-fail/E0118.rs:11:1
   |
11 | impl (u8, u8) { //~ ERROR E0118
   |      ^^^^^^^^ impl requires a base type
   |
   = note: either implement a trait on it or create a newtype to wrap it instead

[Detegr]

In case no one is working with this yet, I can give this a go.