Fix typo <noupdate>

src/fundamentals-of-ai-and-kr/module2/sections/_probabilistic_reasoning.tex

@@ -71,7 +71,7 @@ More specifically, each clause has a probability distribution over its head.
     \item[Queries] \marginnote{Queries}
         Given a ground query $Q$ and a world $w$, the probability of $Q$ being true in $w$ is trivially:
         \[ 
-            \prob{Q \mid w}
+            \prob{Q \mid w} =
             \begin{cases}
                 1 & \text{ if $Q$ is true in $w$}\\
                 0 & \text{ otherwise}