[DOC]: another latex hiccup (#440)

* Fixed another formatting hiccup

* Missed parentheses

docs/tex/api/inference-classes.tex

@@ -90,7 +90,7 @@ \subsubsection{Monte Carlo}
 algorithms proceed by updating one sample $\beta^{(t)},\mathbf{z}^{(t)}$ at a time in the empirical
 approximation.
 Monte Carlo algorithms proceed by updating one sample
-$\beta^{(t)},\mbz^{(t)}$ at a time in the empirical approximation.
+$\beta^{(t)},\mathbf{(z)}^{(t)}$ at a time in the empirical approximation.
 %
 Markov chain Monte Carlo does this sequentially to update
 the current sample (index $t$ of \texttt{tf.Variable}s) conditional on