Remove mention of non-existing calls from docs

The docs mentions a separate seekable API for the various file streams
which don't actually exists. Change this to refer to the generic
GSeekable calls.

gio/gfileinputstream.c

@@ -44,12 +44,10 @@
  *
  * GFileInputStream implements #GSeekable, which allows the input 
  * stream to jump to arbitrary positions in the file, provided the 
- * filesystem of the file allows it. In addition to the generic 
+ * filesystem of the file allows it. To find the position of a file
- * g_seekable_ API, GFileInputStream has its own API for seeking 
+ * input stream, use g_seekable_tell(). To find out if a file input
- * and positioning. To find the position of a file input stream, 
+ * stream supports seeking, use g_seekable_stream_can_seek().
- * use g_file_input_stream_tell(). To find out if a file input 
+ * To position a file input stream, use g_seekable_seek().
- * stream supports seeking, use g_file_input_stream_can_seek().
- * To position a file input stream, use g_file_input_stream_seek().
  **/
 
 static void       g_file_input_stream_seekable_iface_init    (GSeekableIface       *iface);

gio/gfileiostream.c

@@ -46,16 +46,16 @@
  * GFileIOStream implements #GSeekable, which allows the io
  * stream to jump to arbitrary positions in the file and to truncate
  * the file, provided the filesystem of the file supports these
- * operations. In addition to the generic g_seekable_ API,
+ * operations.
- * GFileIOStream has its own API for seeking and positioning.
- * To find the position of a file io stream, use
- * g_file_io_stream_tell().
  *
- * To find out if a file io stream supports seeking, use g_file_io_stream_can_seek().
+ * To find the position of a file io stream, use
- * To position a file io stream, use g_file_io_stream_seek().
+ * g_seekable_tell().
+ *
+ * To find out if a file io stream supports seeking, use g_seekable_can_seek().
+ * To position a file io stream, use g_seekable_seek().
  * To find out if a file io stream supports truncating, use
- * g_file_io_stream_can_truncate(). To truncate a file io
+ * g_seekable_can_truncate(). To truncate a file io
- * stream, use g_file_io_stream_truncate().
+ * stream, use g_seekable_truncate().
  *
  * The default implementation of all the #GFileIOStream operations
  * and the implementation of #GSeekable just call into the same operations

gio/gfileoutputstream.c

@@ -45,15 +45,14 @@
  * GFileOutputStream implements #GSeekable, which allows the output 
  * stream to jump to arbitrary positions in the file and to truncate
  * the file, provided the filesystem of the file supports these 
- * operations. In addition to the generic g_seekable_ API, 
+ * operations.
- * GFileOutputStream has its own API for seeking and positioning. 
+ *
- * To find the position of a file output stream, use 
+ * To find the position of a file output stream, use g_seekable_tell().
- * g_file_output_stream_tell(). To find out if a file output 
+ * To find out if a file output stream supports seeking, use
- * stream supports seeking, use g_file_output_stream_can_seek().
+ * g_seekable_can_seek().To position a file output stream, use
- * To position a file output stream, use g_file_output_stream_seek().
+ * g_seekable_seek(). To find out if a file output stream supports
- * To find out if a file output stream supports truncating, use
+ * truncating, use g_seekable_can_truncate(). To truncate a file output
- * g_file_output_stream_can_truncate(). To truncate a file output
+ * stream, use g_seekable_truncate().
- * stream, use g_file_output_stream_truncate().
  **/
 
 static void       g_file_output_stream_seekable_iface_init    (GSeekableIface       *iface);