Added module references; minor grammatical fixes.

All suggested by Eric Raymond.

Doc/lib/libftplib.tex

@@ -70,6 +70,10 @@ not begin with a digit in the range 1--5.
 
 
 \begin{seealso}
+  \seemodule{netrc}{Parser for the \file{.netrc} file format.  The file
+                    \file{.netrc} is typically used by FTP clients to
+                    load user authentication information before prompting
+                    the user.}
   \seetext{The file \file{Tools/scripts/ftpmirror.py}\index{ftpmirror.py}
            in the Python source distribution is a script that can mirror
            FTP sites, or portions thereof, using the \module{ftplib} module.