address review comments

src/test/ui/if/if-without-else-as-fn-expr.stderr

@@ -2,15 +2,16 @@ error[E0317]: if may be missing an else clause
   --> $DIR/if-without-else-as-fn-expr.rs:2:5
    |
 LL |   fn foo(bar: usize) -> usize {
-   |                         ----- found `usize` because of this return type
+   |                         ----- expected `usize` because of this return type
 LL | /     if bar % 5 == 0 {
 LL | |         return 3;
 LL | |     }
-   | |_____^ expected (), found usize
+   | |_____^ expected usize, found ()
    |
-   = note: expected type `()`
-              found type `usize`
-   = note: `if` expressions without `else` must evaluate to `()`
+   = note: expected type `usize`
+              found type `()`
+   = note: `if` expressions without `else` evaluate to `()`
+   = help: consider adding an `else` block that evaluates to the expected type
 
 error: aborting due to previous error
 

src/test/ui/if/if-without-else-result.stderr

@@ -6,7 +6,8 @@ LL |     let a = if true { true };
    |
    = note: expected type `()`
               found type `bool`
-   = note: `if` expressions without `else` must evaluate to `()`
+   = note: `if` expressions without `else` evaluate to `()`
+   = help: consider adding an `else` block that evaluates to the expected type
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-4201.stderr

@@ -13,7 +13,8 @@ LL | |     };
    |
    = note: expected type `()`
               found type `{integer}`
-   = note: `if` expressions without `else` must evaluate to `()`
+   = note: `if` expressions without `else` evaluate to `()`
+   = help: consider adding an `else` block that evaluates to the expected type
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-50577.stderr

@@ -6,7 +6,8 @@ LL |         Drop = assert_eq!(1, 1)
    |
    = note: expected type `()`
               found type `isize`
-   = note: `if` expressions without `else` must evaluate to `()`
+   = note: `if` expressions without `else` evaluate to `()`
+   = help: consider adding an `else` block that evaluates to the expected type
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: aborting due to previous error