remove trailing whitespace

Author: coke

doc/Language/typesystem.pod6

@@ -65,12 +65,12 @@ user defined types use L<augment|/language/variables#The_augment_Declarator>.
         has $.int;
         method this-is-c { put 'oi' x $!int ~ '‽' }
     }
-    
+
     use MONKEY-TYPING;
     augment class Int {
         method C { C.new(:int(self))}
     }
-    
+
     my $i = 10;
     $i.=C;
     $i.this-is-c();