fix: remove errant dots before \end{align*}

[a-torgovitsky]

Summary

The ali and bigfun snippets in bwA.lua had an extra dot character before \end{align*}, causing the expanded snippet to include a spurious period.

Before:

\begin{align*}
	content here
.\end{align*}

After:

\begin{align*}
	content here
\end{align*}

Changes

• Removed the errant . from line 25 (ali snippet)
• Removed the errant . from line 47 (bigfun snippet)