Fix typo

Author: tbrowder

doc/Type/Signature.pod6

@@ -95,8 +95,8 @@ X<|type constraint (Signature)>
 =head2 Type Constraints
 X<|Constraint>
 
-Parameters can optionally have a type constraint (the default is L<C<Any>>).
-hese can be used to restrict the allowed input to a function.
+iParameters can optionally have a type constraint (the default is L<C<Any>>).
+These can be used to restrict the allowed input to a function.
 
 =begin code :skip-test
 my $sig = :(Int $a, Str $b);