Fix critical markup errors.
diff --git a/Doc/lib/liblogging.tex b/Doc/lib/liblogging.tex
index eeacd5e..df1b07c 100644
--- a/Doc/lib/liblogging.tex
+++ b/Doc/lib/liblogging.tex
@@ -897,7 +897,7 @@
\end{methoddesc}
-\begin{classdesc}PlaceHolder{logger}
+\begin{classdesc}{PlaceHolder}{logger}
\class{PlaceHolder} instances are used in the \class{Manager} logger
hierarchy to take the place of nodes for which no loggers have been defined
@@ -913,7 +913,7 @@
\end{methoddesc}
-\begin{classdesc}RootLogger{level}
+\begin{classdesc}{RootLogger}{level}
A root logger is not that different to any other logger, except that it must
have a logging \var{level} and there is only one instance of it in the