Document <complex #>.conjugate().

Doc/lib/libstdtypes.tex

@@ -221,11 +221,13 @@ comparison operations):
   \lineiii{long(\var{x})}{\var{x} converted to long integer}{(2)}
   \lineiii{float(\var{x})}{\var{x} converted to floating point}{}
   \lineiii{complex(\var{re},\var{im})}{a complex number with real part \var{re}, imaginary part \var{im}.  \var{im} defaults to zero.}{}
+  \lineiii{\var{c}.conjugate()}{conjugate of the complex number \var{c}}{}
   \lineiii{divmod(\var{x}, \var{y})}{the pair \code{(\var{x} / \var{y}, \var{x} \%{} \var{y})}}{(3)}
   \lineiii{pow(\var{x}, \var{y})}{\var{x} to the power \var{y}}{}
   \lineiii{\var{x} ** \var{y}}{\var{x} to the power \var{y}}{}
 \end{tableiii}
 \indexiii{operations on}{numeric}{types}
+\withsubitem{(complex number method)}{\ttindex{conjugate()}}
 
 \noindent
 Notes: