Update test output to changes in rustc

tests/ui/deprecated.stderr

@@ -1,30 +1,30 @@
-error: lint str_to_string has been removed: using `str::to_string` is common even today and specialization will likely happen soon
+error: lint `str_to_string` has been removed: `using `str::to_string` is common even today and specialization will likely happen soon`
  --> $DIR/deprecated.rs:4:8
   |
 4 | #[warn(str_to_string)]
   |        ^^^^^^^^^^^^^
   |
   = note: `-D renamed-and-removed-lints` implied by `-D warnings`
 
-error: lint string_to_string has been removed: using `string::to_string` is common even today and specialization will likely happen soon
+error: lint `string_to_string` has been removed: `using `string::to_string` is common even today and specialization will likely happen soon`
  --> $DIR/deprecated.rs:6:8
   |
 6 | #[warn(string_to_string)]
   |        ^^^^^^^^^^^^^^^^
 
-error: lint unstable_as_slice has been removed: `Vec::as_slice` has been stabilized in 1.7
+error: lint `unstable_as_slice` has been removed: ``Vec::as_slice` has been stabilized in 1.7`
  --> $DIR/deprecated.rs:8:8
   |
 8 | #[warn(unstable_as_slice)]
   |        ^^^^^^^^^^^^^^^^^
 
-error: lint unstable_as_mut_slice has been removed: `Vec::as_mut_slice` has been stabilized in 1.7
+error: lint `unstable_as_mut_slice` has been removed: ``Vec::as_mut_slice` has been stabilized in 1.7`
   --> $DIR/deprecated.rs:10:8
    |
 10 | #[warn(unstable_as_mut_slice)]
    |        ^^^^^^^^^^^^^^^^^^^^^
 
-error: lint misaligned_transmute has been removed: this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr
+error: lint `misaligned_transmute` has been removed: `this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr`
   --> $DIR/deprecated.rs:12:8
    |
 12 | #[warn(misaligned_transmute)]