Update es/about/index.md

Co-authored-by: Chayoung You <[email protected]>

Author: jonjensen

Diff for: es/about/index.md

@@ -220,7 +220,7 @@ del 2003.
 [artima]: http://www.artima.com/intv/closures2.html
 [tiobe]: http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html
 [jruby]: http://jruby.org
-[rubinius]:	https://github.com/rubinius/rubinius
+[rubinius]: https://github.com/rubinius/rubinius
 [truffleruby]: https://github.com/oracle/truffleruby
 [mruby]: http://www.mruby.org/
 [awesome-rubies]: https://github.com/planetruby/awesome-rubies