How many Healing Surges to start with?
If the adventure specifies how many Healing Surge tokens you start with, that's how many you start with. (it overrides the default two instead of adding)


  Unless the adventure says otherwise … place two Healing Surge tokens.


If the adventure says to place three Healing Surge tokens, then "the adventure says otherwise" so you don't follow the default instruction. You'd just have three.