Added the calendar synopsis.

Doc/lib/libcalendar.tex

@@ -3,8 +3,8 @@
 \section{Standard Module \module{calendar}}
 \declaremodule{standard}{calendar}
 
-\modulesynopsis{None}
-
+\modulesynopsis{Functions that emulate the \UNIX{} \program{cal}
+program.}
 
 
 This module allows you to output calendars like the \UNIX{}