Fix typo

Author: bduggan

doc/Language/quoting.pod6

@@ -177,7 +177,7 @@ Therefore its volume should be 42 m³!
 
 By default, only variables with the C<$> sigil are interpolated normally.
 This way, when you write C<"documentation@raku.org">, you aren't
-interpolating the C<@perl6> variable. If that's what you want to do, append
+interpolating the C<@raku> variable. If that's what you want to do, append
 a C<[]> to the variable name:
 
 =begin code :allow<B>