Editing WoW:API IsReferAFriendLinked

{{wowapi}} __NOTOC__
Determines whether the given unit is linked to the player via the Recruit-A-Friend feature.
 isLinked = IsReferAFriendLinked("unit")

== Arguments ==
;unit : String ([[UnitId]]) - Unit to query information about.

== Returns ==
;isLinked : Flag : 1 if the unit is RAF-linked to the player, nil otherwise.

== Example ==
 function HasRecruitAFriendBonus()
     local numPartyMembers = GetNumPartyMembers();
     if numPartyMembers > 0 then
         local memberID = 1;
         while memberID <= numPartyMembers do
             if GetPartyMember(memberID) == 1 then
                 local member = "party" .. memberID;
                 if UnitIsVisible(member) and IsReferAFriendLinked(member) then
                     return true;
                 end
             end
             memberID = memberID + 1;
         end
     end
     return false;
 end