Update *.stderr file

Author: flip1995

tests/ui/assertions_on_constants.stderr

@@ -1,4 +1,4 @@
-error: assert!(true) will be optimized out by the compiler
+error: `assert!(true)` will be optimized out by the compiler
   --> $DIR/assertions_on_constants.rs:9:5
    |
 LL |     assert!(true);
@@ -7,47 +7,47 @@ LL |     assert!(true);
    = note: `-D clippy::assertions-on-constants` implied by `-D warnings`
    = help: remove it
 
-error: assert!(false) should probably be replaced
+error: `assert!(false)` should probably be replaced
   --> $DIR/assertions_on_constants.rs:10:5
    |
 LL |     assert!(false);
    |     ^^^^^^^^^^^^^^^
    |
-   = help: use panic!() or unreachable!()
+   = help: use `panic!()` or `unreachable!()`
 
-error: assert!(true) will be optimized out by the compiler
+error: `assert!(true)` will be optimized out by the compiler
   --> $DIR/assertions_on_constants.rs:11:5
    |
 LL |     assert!(true, "true message");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: remove it
 
-error: assert!(false) should probably be replaced
+error: `assert!(false)` should probably be replaced
   --> $DIR/assertions_on_constants.rs:12:5
    |
 LL |     assert!(false, "false message");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: use panic!() or unreachable!()
+   = help: use `panic!()` or `unreachable!()`
 
-error: assert!(const: true) will be optimized out by the compiler
+error: `assert!(true)` will be optimized out by the compiler
   --> $DIR/assertions_on_constants.rs:15:5
    |
 LL |     assert!(B);
    |     ^^^^^^^^^^^
    |
    = help: remove it
 
-error: assert!(const: false) should probably be replaced
+error: `assert!(false)` should probably be replaced
   --> $DIR/assertions_on_constants.rs:18:5
    |
 LL |     assert!(C);
    |     ^^^^^^^^^^^
    |
-   = help: use panic!() or unreachable!()
+   = help: use `panic!()` or `unreachable!()`
 
-error: assert!(true) will be optimized out by the compiler
+error: `assert!(true)` will be optimized out by the compiler
   --> $DIR/assertions_on_constants.rs:20:5
    |
 LL |     debug_assert!(true);