update for rename of rosetta.mdwn to rosetta2.mdwn

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@@ -80,7 +80,7 @@ what you think you need in order to solve the problem.
 [[Advanced notes|topics/week1 advanced notes]]
 
 (**Intermezzo**)
-> The [[differences between our made-up language and Scheme, OCaml, and Haskell|rosetta]];
+> The [[differences between our made-up language and Scheme, OCaml, and Haskell|rosetta2]];
 Help on [[learning Scheme]], [[OCaml|learning OCaml]], and [[Haskell|learning Haskell]];
 [[What do words like "interpreter" and "compiler" mean?|ecosystem]]