Tell what the result objects are (based on comment from the list).

Doc/lib/libpopen2.tex

@@ -18,14 +18,15 @@ functions:
 
 \begin{funcdesc}{popen2}{cmd\optional{, bufsize}}
 Executes \var{cmd} as a sub-process.  If \var{bufsize} is specified, 
-it specifies the buffer size for the I/O pipes.  Returns
-\code{(\var{child_stdout}, \var{child_stdin})}.
+it specifies the buffer size for the I/O pipes.  Returns the file
+objects \code{(\var{child_stdout}, \var{child_stdin})}.
 \end{funcdesc}
 
 \begin{funcdesc}{popen3}{cmd\optional{, bufsize}}
 Executes \var{cmd} as a sub-process.  If \var{bufsize} is specified, 
-it specifies the buffer size for the I/O pipes.  Returns
-\code{(\var{child_stdout}, \var{child_stdin}, \var{child_stderr})}.
+it specifies the buffer size for the I/O pipes.  Returns the file
+objects \code{(\var{child_stdout}, \var{child_stdin},
+\var{child_stderr})}.
 \end{funcdesc}
 
 The class defining the objects returned by the factory functions is