gmio_stl: fix doc

src/gmio_stl/stl_mesh_creator.h

@@ -39,6 +39,9 @@ struct gmio_stl_mesh_creator
      *  name \p solid_name
      *
      *  Optional function useful only with STL ascii (ie. gmio_stla_read())
+     *
+     *  The argument \p stream_size is the total size (in bytes) of the input
+     *  stream
      */
     void (*ascii_begin_solid_func)(
             void* cookie, size_t stream_size, const char* solid_name);

src/gmio_stl/stla_read.c

@@ -82,7 +82,7 @@ typedef struct
 {
     /* Copy of gmio_stla_read() corresponding argument */
     gmio_transfer_t* transfer;
-    /* Copy of gmio_stla_read_options::stream_size */
+    /* Cache for gmio_stream_size(&transfer->stream) */
     size_t stream_size;
     /* Offset (in bytes) from beginning of stream : current position */
     size_t stream_offset;