Hi! That "noted below" refers to later on the list (so I suppose it should say "as noted on the next page"), the entry that reads:
- spend 2 to gain a new Quality (at 1)...
... and I guess I messed up in phrasing, because that parenthetical should only refer to if a Quality falls to 0. If a Relationship falls to 0 during play, and then it would make sense to make a new Relationship with them that would be the bullet above (just spending 1 check). Usually, though, a Relationship falling to 0 indicates that that character is seriously distanced from the protagonist or killed, so it would have to be a pretty specific situation.
To put it another way, if a Quality or a Relationship falls to 0 and you want it back, it's as if you're making a new one, as opposed to "boosting" the old one from 0. Mechanically, that just means you need to spend 2 instead of 1 on the Quality.
I apologize for the awkwardness of the phrasing there, I hope this clears it up!