bsip35: more settling rules after globally settled

Add description for the old total supply rule (no change).

bsip-0035.md

@@ -240,6 +240,8 @@ The detailed rules proposes in this BSIP (new rules highlighted):
    nothing, let it pay 1 Satoshi (round up).**
   * when paying a settle order from global settlement fund, in favor of global
     settlement fund, round down receiving collateral amount
+    * If the settling amount is equal to total supply of that asset, pay the
+   whole remaining settlement fund to the settle order;
     * **when the asset is not a prediction market, if the settle order would
    receive nothing, raise an exception (aka let the operation fail).**
 
@@ -319,7 +321,8 @@ once it's zero, and the asset is not a prediction market, let it be `1`.
 ## When Paying A Settle Order From Global Settlement Fund
 
 In `do_apply(...)` function of `asset_settle_evaluator` class,
-after calculated `settled_amount`, check if it is zero. If the answer is `true`,
+after calculated `settled_amount` and adjusted it according to the "total
+supply" rule, check if it's zero. If the answer is `true`,
 and the asset is not a prediction maket, throw a `fc::exception`.
 
 # Discussion