Rollup merge of rust-lang#53600 - varkor:expected-generic-arg-s, r=eddyb

Fix a grammatical mistake in "expected generic arguments" errors

r? @eddyb

Author: Mark-Simulacrum

src/librustc_typeck/astconv.rs

@@ -371,7 +371,7 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx>+'o {
                     quantifier,
                     bound,
                     kind,
-                    if required != 1 { "s" } else { "" },
+                    if bound != 1 { "s" } else { "" },
                 )
             };
 

src/test/ui/generic/generic-impl-more-params-with-defaults.stderr

@@ -2,7 +2,7 @@ error[E0244]: wrong number of type arguments: expected at most 2, found 3
   --> $DIR/generic-impl-more-params-with-defaults.rs:23:5
    |
 LL |     Vec::<isize, Heap, bool>::new();
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected at most 2 type argument
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected at most 2 type arguments
 
 error: aborting due to previous error
 

src/test/ui/generic/generic-type-more-params-with-defaults.stderr

@@ -2,7 +2,7 @@ error[E0244]: wrong number of type arguments: expected at most 2, found 3
   --> $DIR/generic-type-more-params-with-defaults.rs:19:12
    |
 LL |     let _: Vec<isize, Heap, bool>;
-   |            ^^^^^^^^^^^^^^^^^^^^^^ expected at most 2 type argument
+   |            ^^^^^^^^^^^^^^^^^^^^^^ expected at most 2 type arguments
 
 error: aborting due to previous error