Removed (empty) description of \optional from the "Inline Markup"

section; that's not really the right place for it.

Doc/doc/doc.tex

@@ -435,9 +435,6 @@ distribution, to create or maintain whole documents or sections.
       The name of a USENET newsgroup.
     \end{macrodesc}
 
-    \begin{macrodesc}{optional}{\p{text}}
-    \end{macrodesc}
-
     \begin{macrodesc}{program}{\p{name}}
       The name of an executable program.  This may differ from the
       file name for the executable for some platforms.  In particular,