Use \programopt in one place.

Doc/lib/libstdwin.tex

@@ -26,15 +26,15 @@ This module defines several new object types and functions that
 provide access to the functionality of STDWIN.
 
 On \UNIX{} running X11, it can only be used if the \envvar{DISPLAY}
-environment variable is set or an explicit \samp{-display
-\var{displayname}} argument is passed to the Python interpreter.
+environment variable is set or an explicit
+\programopt{-display} \var{displayname} argument is passed to the
+Python interpreter.
 
 Functions have names that usually resemble their C STDWIN counterparts
-with the initial `w' dropped.
-Points are represented by pairs of integers; rectangles
-by pairs of points.
-For a complete description of STDWIN please refer to the documentation
-of STDWIN for C programmers (aforementioned CWI report).
+with the initial `w' dropped.  Points are represented by pairs of
+integers; rectangles by pairs of points.  For a complete description
+of STDWIN please refer to the documentation of STDWIN for C
+programmers (aforementioned CWI report).
 
 \subsection{Functions Defined in Module \module{stdwin}}
 \nodename{STDWIN Functions}