Fixed some typos.

src/cat/cat/universal.tex

@@ -42,7 +42,7 @@
     \begin{enumerate}
         \item $P \in \obj{\catc}$.
         \item For each $i \in I$, $\iota_i \in \mor{A_i P}$.
-        \item[\textbf{(U)}] For any pair $(C, \seqi{f})$ satisfying (1) and (2), there exists a unique $f \in \mor{P, C}$ such that the following diagram commutes
+        \item[(U)] For any pair $(C, \seqi{f})$ satisfying (1) and (2), there exists a unique $f \in \mor{P, C}$ such that the following diagram commutes
 
         \[
         \xymatrix{