Added version annotations, remove hard tabs.

Doc/api/abstract.tex

@@ -868,42 +868,46 @@ else {
     /* continue doing useful work */
 }
 
-\section{Buffer Protocol \label{buffer}}
+\section{Buffer Protocol \label{abstract-buffer}}
 
 \begin{cfuncdesc}{int}{PyObject_AsCharBuffer}{PyObject *obj,
-					      const char **buffer,
-					      int *buffer_len}
+                                              const char **buffer,
+                                              int *buffer_len}
   Returns a pointer to a read-only memory location useable as character-
   based input.  The \var{obj} argument must support the single-segment
   character buffer interface.  On success, returns \code{1}, sets
   \var{buffer} to the memory location and \var{buffer} to the buffer
   length.  Returns \code{0} and sets a \exception{TypeError} on error.
+  \versionadded{1.6}
 \end{cfuncdesc}
 
 \begin{cfuncdesc}{int}{PyObject_AsReadBuffer}{PyObject *obj,
-					      const char **buffer,
-					      int *buffer_len}
+                                              const char **buffer,
+                                              int *buffer_len}
   Returns a pointer to a read-only memory location containing
   arbitrary data.  The \var{obj} argument must support the
   single-segment readable buffer interface.  On success, returns
   \code{1}, sets \var{buffer} to the memory location and \var{buffer}
   to the buffer length.  Returns \code{0} and sets a
   \exception{TypeError} on error.
+  \versionadded{1.6}
 \end{cfuncdesc}
 
 \begin{cfuncdesc}{int}{PyObject_CheckReadBuffer}{PyObject *o}
   Returns \code{1} if \var{o} supports the single-segment readable
   buffer interface.  Otherwise returns \code{0}.
+  \versionadded{2.2}
 \enc{cfuncdesc}
 
 \begin{cfuncdesc}{int}{PyObject_AsWriteBuffer}{PyObject *obj,
-	 				       const char **buffer,
- 					       int *buffer_len}
+                                               const char **buffer,
+                                               int *buffer_len}
   Returns a pointer to a writeable memory location.  The \var{obj}
   argument must support the single-segment, character buffer
   interface.  On success, returns \code{1}, sets \var{buffer} to the
   memory location and \var{buffer} to the buffer length.  Returns
   \code{0} and sets a \exception{TypeError} on error.
+  \versionadded{1.6}
 \end{cfuncdesc}
 
 \end{verbatim}