compiler: fix some typos

compiler/rustc_ast_lowering/src/item.rs

@@ -1366,7 +1366,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         generics: &Generics,
         itctx: ImplTraitContext<'_, 'hir>,
     ) -> GenericsCtor<'hir> {
-        // Error if `?Trait` bounds in where clauses don't refer directly to type paramters.
+        // Error if `?Trait` bounds in where clauses don't refer directly to type parameters.
         // Note: we used to clone these bounds directly onto the type parameter (and avoid lowering
         // these into hir when we lower thee where clauses), but this makes it quite difficult to
         // keep track of the Span info. Now, `add_implicitly_sized` in `AstConv` checks both param bounds and