Change wording for function without return value

Fix #62677

src/test/ui/issues/issue-32323.stderr

@@ -4,7 +4,7 @@ error[E0308]: mismatched types
 LL | pub fn f<'a, T: Tr<'a>>() -> <T as Tr<'a>>::Out {}
    |        -                     ^^^^^^^^^^^^^^^^^^ expected associated type, found ()
    |        |
-   |        this function's body doesn't return
+   |        this function's body doesn't return a value
    |
    = note: expected type `<T as Tr<'a>>::Out`
               found type `()`

src/test/ui/issues/issue-43162.stderr

@@ -16,7 +16,7 @@ error[E0308]: mismatched types
 LL | fn foo() -> bool {
    |    ---      ^^^^ expected bool, found ()
    |    |
-   |    this function's body doesn't return
+   |    this function's body doesn't return a value
 LL |
 LL |     break true;
    |               - help: consider removing this semicolon

src/test/ui/issues/issue-44023.stderr

@@ -4,7 +4,7 @@ error[E0308]: mismatched types
 LL | fn საჭმელად_გემრიელი_სადილი ( ) -> isize {
    |    ------------------------        ^^^^^ expected isize, found ()
    |    |
-   |    this function's body doesn't return
+   |    this function's body doesn't return a value
    |
    = note: expected type `isize`
               found type `()`

src/test/ui/issues/issue-6458-4.stderr

@@ -4,7 +4,7 @@ error[E0308]: mismatched types
 LL | fn foo(b: bool) -> Result<bool,String> {
    |    ---             ^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found ()
    |    |
-   |    this function's body doesn't return
+   |    this function's body doesn't return a value
 LL |     Err("bar".to_string());
    |                           - help: consider removing this semicolon
    |