Remove harmless typo

Author: stoned

doc/Language/variables.pod6

@@ -744,7 +744,7 @@ Use C<.clone> or coercion to create a new container that can be bound to.
     sub f() {
         state $i;
         $i++;
-        @a\      .push: "k$i" => $i;
+        @a       .push: "k$i" => $i;
         @a-cloned.push: "k$i" => $i.clone;
     };