Merge pull request #31366 from ypresto/fix-comment-unknown

Fix outdated comments for unknown type

Author: Orta

Diff for: src/compiler/checker.ts

@@ -7676,7 +7676,7 @@ namespace ts {
                 else {
                     // Otherwise, get the declared constraint type, and if the constraint type is a type parameter,
                     // get the constraint of that type parameter. If the resulting type is an indexed type 'keyof T',
-                    // the modifiers type is T. Otherwise, the modifiers type is {}.
+                    // the modifiers type is T. Otherwise, the modifiers type is unknown.
                     const declaredType = <MappedType>getTypeFromMappedTypeNode(type.declaration);
                     const constraint = getConstraintTypeFromMappedType(declaredType);
                     const extendedConstraint = constraint && constraint.flags & TypeFlags.TypeParameter ? getConstraintOfTypeParameter(<TypeParameter>constraint) : constraint;
@@ -23360,7 +23360,7 @@ namespace ts {
                 links.type = contextualType;
                 const decl = parameter.valueDeclaration as ParameterDeclaration;
                 if (decl.name.kind !== SyntaxKind.Identifier) {
-                    // if inference didn't come up with anything but {}, fall back to the binding pattern if present.
+                    // if inference didn't come up with anything but unknown, fall back to the binding pattern if present.
                     if (links.type === unknownType) {
                         links.type = getTypeFromBindingPattern(decl.name);
                     }