Update docs/learn/combinatorial-tokens.md

Co-authored-by: Chralt <[email protected]>

docs/learn/combinatorial-tokens.md

@@ -137,7 +137,7 @@ defined by Hanson in [H03a]:
 A fundamental idea is that trades made on prediction markets are not so much
 absolute bets ("I bet $10 that Hillary will win at 1:1 odds"), but rather that
 trades are made to "correct" the forecast of the market by changing the prices
-of the outcome. The agent executing the trade pays a price to do so, but is
+of the outcomes. The agent executing the trade pays a price to do so, but is
 rewarded if the prediction is closer to the truth than the current one.
 
 One could say that the agent buying $H \Rightarrow D$ claims that $H \land D$ is