Fix latex typos as spotted by George Yoshida.
diff --git a/Doc/lib/libexcs.tex b/Doc/lib/libexcs.tex
index d3b5ddd..f52ff0a 100644
--- a/Doc/lib/libexcs.tex
+++ b/Doc/lib/libexcs.tex
@@ -82,6 +82,7 @@
eventually be deprecated and thus its use is discouraged.
\versionchanged[Changed to inherit from \exception{BaseException}]{2.5}
\versionadded{2.5}
+\end{excdesc}
\begin{excdesc}{Exception}
All built-in, non-system-exiting exceptions are derived
@@ -168,11 +169,12 @@
\file{pyconfig.h} file.
\end{excdesc}
-\begin{excdesv}{GeneratorExit}
+\begin{excdesc}{GeneratorExit}
Raise when a generator's \method{close()} method is called.
It directly inherits from \exception{Exception} instead of
\exception{StandardError} since it is technically not an error.
\versionadded{2.5}
+\end{excdesc}
\begin{excdesc}{IOError}
% XXXJH xrefs here