Fix punctuation typo.

Doc/lib/libdecimal.tex

@@ -371,7 +371,7 @@ also have a number of specialized methods:
   \constant{Decimal("0e0")}. Used for producing canonical values for members
   of an equivalence class. For example, \code{Decimal("32.100")} and
   \code{Decimal("0.321000e+2")} both normalize to the equivalent value
-  \code{Decimal("32.1")},
+  \code{Decimal("32.1")}.
 \end{methoddesc}                                              
 
 \begin{methoddesc}{quantize}