remove trailing ws

Author: coke

doc/Language/operators.pod6

@@ -1063,7 +1063,7 @@ and C<$b> L«C<Int>|/type/Int». Returns an empty string if C<< $b <= 0 >>.
 
     say 'ab' x 3;           # ababab
     say 42 x 3;             # 424242
-    
+
     my $a = 'a'.IO; my $b = 3.5;
     say $a x $b;            # aaa