fix markup

Doc/lib/libcurses.tex

@@ -542,7 +542,7 @@ Allow use of default values for colors on terminals supporting this
 feature. Use this to support transparency in your
 application.  The default color is assigned to the color number -1.
 After calling this function, 
-\function{init_pair(x, curses.COLOR_RED, -1)} initializes, for instance,
+\code{init_pair(x, curses.COLOR_RED, -1)} initializes, for instance,
 color pair \var{x} to a red foreground color on the default background.
 \end{funcdesc}