remove unused, unexplained exception

doc/ZConfig/zconfig.tex

@@ -1147,9 +1147,6 @@ The following exceptions are defined by this package:
   was detected.
 \end{excdesc}
 
-\begin{excdesc}{ConfigurationTypeError}
-\end{excdesc}
-
 \begin{excdesc}{ConfigurationMissingSectionError}
   Raised when a requested named section is not available.
 \end{excdesc}