Add required phrase tag to ruby rule

Signed-off-by: Philippe Ombredanne <pombredanne@aboutcode.org>

Author: pombredanne

src/licensedcode/data/rules/bsd-simplified_or_ruby_2.RULE

@@ -5,4 +5,4 @@ relevance: 100
 ---
 
 is free software; you can redistribute it and/or
-# modify it under the terms of the ruby license.
+# modify it {{under the terms of the ruby license.}}