O_BINARY: Documented this constant; omission noted by David Ascher.

access():  Corrected availability statement; error pointed out by
           Tim Peters.

Doc/lib/libos.tex

@@ -475,6 +475,13 @@ These can be bit-wise OR'd together.
 Availability: Macintosh, \UNIX{}, Windows.
 \end{datadesc}
 
+\begin{datadesc}{O_BINARY}
+Option for the \var{flag} argument to the \function{open()} function.
+This can be bit-wise OR'd together with those listed above.
+Availability: Macintosh, Windows.
+% XXX need to check on the availability of this one.
+\end{datadesc}
+
 
 \subsection{Files and Directories \label{os-file-dir}}
 
@@ -485,7 +492,7 @@ existence of \var{path}, or it can be the inclusive OR of one or more
 of \constant{R_OK}, \constant{W_OK}, and \constant{X_OK} to test
 permissions.  Return \code{1} if access is allowed, \code{0} if not.
 See the \UNIX{} man page \manpage{access}{2} for more information.
-Availability: \UNIX{}.
+Availability: \UNIX{}, Windows.
 \end{funcdesc}
 
 \begin{datadesc}{F_OK}