Fix typo

free-programming-books.md

@@ -1232,7 +1232,7 @@ See also [TeX](#tex)
 * [Real World OCaml](https://realworldocaml.org/v1/en/html/)
 * [Think OCaml](http://greenteapress.com/thinkocaml/index.html) - Allen B. Downey and Nicholas Monje
 * [Unix System Programming in OCaml](http://ocamlunix.forge.ocamlcore.org/)
-* [Using, Understanding, and Unraveling The OCaml Language: From Practice to Theory and vice versa](http://pauillac.inria.fr/~remy/cours/appsem/) - Didier R´emy
+* [Using, Understanding, and Unraveling The OCaml Language: From Practice to Theory and vice versa](http://pauillac.inria.fr/~remy/cours/appsem/) - Didier Rémy
 
 
 ###Octave