Repair a duplicate label and some obsolete uses of \setindexsubitem.
diff --git a/Doc/lib/libposixfile.tex b/Doc/lib/libposixfile.tex
index 62861f0..5c86f3e 100644
--- a/Doc/lib/libposixfile.tex
+++ b/Doc/lib/libposixfile.tex
@@ -62,8 +62,7 @@
The posixfile object defines the following additional methods:
-\setindexsubitem{(posixfile method)}
-\begin{funcdesc}{lock}{fmt, \optional{len\optional{, start\optional{, whence}}}}
+\begin{methoddesc}[posixfile]{lock}{fmt, \optional{len\optional{, start\optional{, whence}}}}
Lock the specified section of the file that the file object is
referring to. The format is explained
below in a table. The \var{len} argument specifies the length of the
@@ -74,9 +73,9 @@
\constant{SEEK_CUR} or \constant{SEEK_END}. The default is
\constant{SEEK_SET}. For more information about the arguments refer
to the \manpage{fcntl}{2} manual page on your system.
-\end{funcdesc}
+\end{methoddesc}
-\begin{funcdesc}{flags}{\optional{flags}}
+\begin{methoddesc}[posixfile]{flags}{\optional{flags}}
Set the specified flags for the file that the file object is referring
to. The new flags are ORed with the old flags, unless specified
otherwise. The format is explained below in a table. Without
@@ -84,25 +83,25 @@
a string indicating the current flags is returned (this is
the same as the \samp{?} modifier). For more information about the
flags refer to the \manpage{fcntl}{2} manual page on your system.
-\end{funcdesc}
+\end{methoddesc}
-\begin{funcdesc}{dup}{}
+\begin{methoddesc}[posixfile]{dup}{}
Duplicate the file object and the underlying file pointer and file
descriptor. The resulting object behaves as if it were newly
opened.
-\end{funcdesc}
+\end{methoddesc}
-\begin{funcdesc}{dup2}{fd}
+\begin{methoddesc}[posixfile]{dup2}{fd}
Duplicate the file object and the underlying file pointer and file
descriptor. The new object will have the given file descriptor.
Otherwise the resulting object behaves as if it were newly opened.
-\end{funcdesc}
+\end{methoddesc}
-\begin{funcdesc}{file}{}
+\begin{methoddesc}[posixfile]{file}{}
Return the standard file object that the posixfile object is based
on. This is sometimes necessary for functions that insist on a
standard file object.
-\end{funcdesc}
+\end{methoddesc}
All methods raise \exception{IOError} when the request fails.