fix inconsistency in RuleSets

[costateixeira]

The example for rulesets is not correct - the parameter is type but it's used as code Reference.md, Line 2080:

RuleSet: Question(linkId, text, type, repeats)

• item[+].linkId = "{linkId}"
• item[=].text = "{text}"
• item[=].type = #{code}
• item[=].repeats = {repeats}