vcs: Fix pygments highlighting of code blocks with $ and '
Pygments highlighting breaks when a code block ends with a lone $ on a
line or when it has an unmatched '.
\documentclass{article}
\begin{document}
This is my first LaTeX document.
\begin{equation}
a^2 + b^2 = c^2
\end{equation}
\[
\begin{pmatrix}
\alpha& \beta^{*}\\
\gamma^{*}& \delta
\end{pmatrix}
\]
\end{document}